“All glories to Rādhā’s love for Kṛṣṇa, the enemy of the demon Mura! Although it is all-pervading, it tends to increase at every moment. Although it is important, it is devoid of pride. And although it is pure, it is always beset with duplicity.”
This is a verse from the Dāna-keli-kaumudī (2) of Śrīla Rūpa Gosvāmī.
(Sri Caitanya Caritamrta-----1:4:131-----translation and purport).

In the Bhakti-ratnākara there is a list of the books Śrī Rūpa Gosvāmī compiled. Of all his books, the following sixteen are very popular among Vaiṣṇavas: (1) Haṁsadūta, (2) Uddhava-sandeśa, (3) Kṛṣṇa-janma-tithi-vidhi, (4 and 5) Rādhā-kṛṣṇa-gaṇoddeśa-dīpikā, Bṛhat (major) and Laghu (minor), (6) Stavamālā, (7) Vidagdha-mādhava, (8) Lalita-mādhava, (9) Dāna-keli-kaumudi, (10) Bhakti-rasāmṛta-sindhu (this is the most celebrated book by Śrī Rūpa Gosvāmī), (11) Ujjvala-nīlamaṇi, (12) Ākhyāta-candrikā, (13) Mathurā-mahimā, (14) Padyāvalī, (15) Nāṭaka-candrikā and (16) Laghu-bhāgavatāmṛta.
(Sri Caitanya Caritamrta-----1:10:84------purport).

Śrīla Gadādhara dāsa was always fully absorbed in ecstasy as a gopī. In his house Lord Nityānanda enacted the drama Dāna-keli.
(Sri Caitanya Caritamrta-----1:11:17-----translation).

Śrīla Rūpa Gosvāmī also compiled the Dāna-keli-kaumudī, Stavāvalī, Līlā-cchanda, Padyāvalī, Govinda-virudāvalī, Mathurā-māhātmya and Nāṭaka-varṇana.
(Sri Caitanya Caritamrta-----2:1:40-----translation).

Being a cowherd girl, Śrīmatī Rādhārāṇī regularly carries milk in a container and often goes to sell the milk on the other side of the Yamunā. To cross the river, She has to pay the boatman, and the spot where the boatman collects his fares is called the dāna-ghāṭi. Lord Śrī Kṛṣṇa stops Her from going, telling Her, "First You have to pay the fee; then You will be allowed to go." This pastime is called dāna-keli-līlā. Similarly, if Śrīmatī Rādhārāṇī wants to pick a flower, Śrī Kṛṣṇa claims to be the garden's proprietor and prohibits Her. This pastime is called kila-kiñcita. Rādhārāṇī’s shyness arises due to Śrī Kṛṣṇa's prohibitions, and ecstatic loving bodily symptoms called kila-kiñcita-bhāva are manifest at this time.
(Sri Caitanya Caritamrta-----2:14:173-----purport).

Śrīla Rūpa Gosvāmī compiled 100,000 verses, beginning with the book Dāna-keli-kaumudī. In all these scriptures he elaborately explained the transcendental mellows of the activities of Vṛndāvana.
Referring to the words lakṣa-grantha ("100,000 verses"), Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura says that the total number of verses written by Śrīla Rūpa Gosvāmī is 100,000 (eka-lakṣa or lakṣa-grantha). The copyists count both the verses and the prose sections of the Sanskrit works. One should not mistakenly think that Śrīla Rūpa Gosvāmī compiled 100,000 books. He actually wrote sixteen books, as mentioned in the First Wave of the Bhakti-ratnākara (śrī-rūpa-gosvāmī grantha ṣoḍaśa karila).
(Sri Caitanya Caritamrta-----3:4:226-----translation and purport).

In Dāna-keli-kaumudī Śrīmatī Rādhārāṇī addresses one of Her friends in this manner: "My dear friend, if I cannot hear of the glorious activities of Kṛṣṇa, it is better for Me to become deaf. And because I am now unable to see Him, it would be good for Me to be a blind woman." This is another instance of disappointment due to separation from Kṛṣṇa.
(Nectar of Devotion).

A pure devotee of Kṛṣṇa is always specifically qualified with nectarean qualifications and sometimes with the qualifications of butter and honey. On the whole, the heart in any of the different conditions mentioned above can be melted under certain circumstances, just as a hard diamond is sometimes melted by a combination of certain chemicals. In the Dāna-keli-kaumudī it is stated, "When love develops in the heart of a devotee, he cannot check the transformation of his sentiments. His heart is just like the ocean at the rising of the moon, when the ebb tide cannot be checked: immediately there must be movement of high waves." Although in its natural state the ocean is always grave and unfathomable, when the moon rises, nothing can check the ocean's agitation. Similarly, those who are pure devotees cannot on any account check the movement of their feelings within.
(Nectar of Devotion).

In the same Padyāvalī there is the following description, which is taken as a sign of frustration in conjugal love. Śrīmatī Rādhārāṇī said, "Dear Mr. Cupid, please do not excite Me by throwing your arrows at My body. Dear Mr. Air, please do not arouse Me with the fragrance of flowers. I am now bereft of Kṛṣṇa's loving attitude, and so, under the circumstances, what is the use of My sustaining this useless body? There is no need for such a body by any living entity." This is a sign of frustration in ecstatic love for Kṛṣṇa.
Similarly, in Dāna-keli-kaumudī, Śrīmatī Rādhārāṇī, pointing to Kṛṣṇa, says, "This clever boy of the forest has the beauty of a bluish lotus flower, and He can attract all the young girls of the universe. Now, after giving Me a taste of His transcendental body, He has enthused Me, and it is more than I can tolerate. I am now feeling like a female elephant who has been enthused by a male elephant!" This is an instance of jubilation in ecstatic love with Kṛṣṇa.
(Nectar of Devotion).