Śrīmatī Rādhārāṇī is as fully spiritual as Kṛṣṇa. No one should consider Her to be material. She is definitely not like the conditioned souls, who have material bodies, gross and subtle, covered by material senses. She is all-spiritual, and both Her body and Her mind are of the same spiritual embodiment. Because Her body is spiritual, Her senses are also spiritual. Thus Her body, mind and senses fully shine in love of Kṛṣṇa. She is the personified hlādinī-śakti (the pleasure-giving energy of the Lord's internal potency), and therefore She is the only source of enjoyment for Śrī Kṛṣṇa.
Śrī Kṛṣṇa cannot enjoy anything that is internally different from Him. Therefore Rādhā and Śrī Kṛṣṇa are identical. The sandhinī portion of Śrī Kṛṣṇa's internal potency has manifested the all-attractive form of Śrī Kṛṣṇa, and the same internal potency, in the hlādinī feature, has presented Śrīmatī Rādhārāṇī, who is the attraction for the all-attractive. No one can match ŚrīmatīRādhārāṇī in the transcendental pastimes of Śrī Kṛṣṇa.
(Sri Caitanya Caritamrta----1:4:71----purport).

As already explained, Kṛṣṇa and Rādhā are one in two. They are identical. Kṛṣṇa expands Himself in multi-incarnations and plenary portions like the puruṣas. Similarly, Śrīmatī Rādhārāṇīexpands Herself in multiforms as the goddesses of fortune, the queens and the damsels of Vraja. Such expansions from Śrīmatī Rādhārāṇī are all Her plenary portions. All these womanly forms of Kṛṣṇa are expansions corresponding to His plenary expansions of Viṣṇu forms. These expansions have been compared to reflected forms of the original form. There is no difference between the original form and the reflected forms. The female reflections of Kṛṣṇa's pleasure potency are as good as Kṛṣṇa Himself.
The plenary expansions of Kṛṣṇa's personality are called vaibhava-vilāsa and vaibhava-prakāśa, and Rādhā’s expansions are similarly described. The goddesses of fortune are Her vaibhava-vilāsa forms, and the queens are Her vaibhava-prakāśa forms. The personal associates of Rādhārāṇī, the damsels of Vraja, are direct expansions of Her body. As expansions of Her personal form and transcendental disposition, they are agents of different reciprocations of love in the pastimes of Lord Kṛṣṇa, under the supreme direction of Śrīmatī Rādhārāṇī. In the transcendental realm, enjoyment is fully relished in variety. The exuberance of transcendental mellows is increased by the association of a large number of personalities similar toRādhārāṇī, who are also known as gopīs or sakhīs. The variety of innumerable mistresses is a source of relish for Śrī Kṛṣṇa, and therefore these expansions from Śrīmatī Rādhārāṇī are necessary for enhancing the pleasure potency of Śrī Kṛṣṇa. Their transcendental exchanges of love are the superexcellent affairs of the pastimes in Vṛndāvana. By these expansions of Śrīmatī Rādhārāṇī’s personal body, She helps Lord Kṛṣṇa taste the rāsa dance and other, similar activities.
(Sri Caitanya Caritamrta----1:4:81----purport).

Rādhā is the one who gives pleasure to Govinda, and She is also the enchantress of Govinda. She is the be-all and end-all of Govinda, and the crest jewel of all His consorts.
(Sri Caitanya Caritamrta----1:4:82----translation).

"The transcendental goddess Śrīmatī Rādhārāṇī is the direct counterpart of Lord Śrī Kṛṣṇa. She is the central figure for all the goddesses of fortune. She possesses all the attractiveness to attract the all-attractive Personality of Godhead. She is the primeval internal potency of the Lord."
(Sri Caitanya Caritamrta----1:4:83----translation).

Her worship (ārādhana) consists of fulfilling the desires of Lord Kṛṣṇa. Therefore the Purāṇas call Her Rādhikā.
The name "Rādhā" is derived from the root word ārādhana, which means "worship." The personality who excels all in worshiping Kṛṣṇa may therefore be called Rādhikā, the greatest servitor.
(Sri Caitanya Caritamrta----1:4:87----translation and purport).

Therefore Rādhā is parama-devatā, the supreme goddess, and She is worshipable for everyone. She is the protectress of all, and She is the mother of the entire universe.
(Sri Caitanya Caritamrta----1:4:89----translation).

Śrīmatī Rādhikā fulfills all the desires of Lord Kṛṣṇa. This is the meaning of "sarva-kānti."
(Sri Caitanya Caritamrta----1:4:94----translation).

Lord Kṛṣṇa enchants the world, but Śrī Rādhā enchants even Him. Therefore She is the supreme goddess of all.
(Sri Caitanya Caritamrta----1:4:95----translation).

Śrī Rādhā is the full power, and Lord Kṛṣṇa is the possessor of full power. The two are not different, as evidenced by the revealed scriptures.
(Sri Caitanya Caritamrta----1:4:96----translation).

Thus Rādhā and Lord Kṛṣṇa are one, yet They have taken two forms to enjoy the mellows of pastimes.
(Sri Caitanya Caritamrta----1:4:98----translation).

To promulgate prema-bhakti (devotional service in love of Godhead), Kṛṣṇa appeared as Śrī Kṛṣṇa Caitanya with the mood and complexion of Śrī Rādhā.
(Sri Caitanya Caritamrta----1:4:99----translation).