My mother, being pregnant, desired the safety of her embryo and desired to give birth after her husband's arrival. Thus she stayed at Nārada Muni's āśrama, where she rendered service unto Nārada Muni with great devotion.
It is stated in Śrīmad-Bhāgavatam (9.19.17)

mātrā svasrā duhitrā vā
nāviviktāsano bhavet
balavān indriya-grāmo
vidvāṁsam api karṣati
One should not remain in a secluded place with a woman, even one's mother, sister, or daughter. Nonetheless, although one is strictly prohibited from staying with a woman in a secluded place, Nārada Muni gave shelter to Prahlāda Mahārāja's young mother, who rendered service to him with great devotion and faith. Does this mean that Nārada Muni transgressed the Vedic injunctions? Certainly he did not. Such injunctions are intended for mundane creatures, but Nārada Muni is transcendental to mundane categories. Nārada Muni is a great saint and is transcendentally situated. Therefore, although he was a young man, he could give shelter to a young woman and accept her service. Haridāsa Ṭhākura also spoke with a young woman, a prostitute, in the dead of night, but the woman could not deviate his mind. Instead, she became a Vaiṣṇavī, a pure devotee, by the benediction of Haridāsa Ṭhākura. Ordinary persons, however, should not imitate such highly elevated devotees. Ordinary persons must strictly observe the rules and regulations by staying aloof from the association of women. No one should imitate Nārada Muni or Haridāsa Ṭhākura. It is said, vaiṣṇavera kriyā-mudrā vijñe nā bujhaya. Even if a man is very advanced in learning, he cannot understand the behavior of a Vaiṣṇava. Anyone can take shelter of a pure Vaiṣṇava, without fear. Therefore in the previous verse it has been distinctly said, devarṣer antike sākuto-bhayā: Kayādhu, the mother of Prahlāda Mahārāja, stayed under the protection of Nārada Muni without fear from any direction. Similarly, Nārada Muni, in his transcendental position, stayed with the young woman without fear of deviation. Nārada Muni, Haridāsa Ṭhākura and similar ācāryas especially empowered to broadcast the glories of the Lord cannot be brought down to the material platform. Therefore one is strictly forbidden to think that the ācārya is an ordinary human being (guruṣu nara-matiḥ).

(Srimad Bhagavatam-------7:7:14--------translation and purport).

According to scriptures also, there are seven mothers: (1) the real mother, (2) the wife of the spiritual master, (3) the wife of a brāhmaṇa, (4) the wife of the king, (5) the cow, (6) the nurse, and (7) the earth. All of them are mothers.

(Srimad Bhagavatam-------1:11:28-------purport).

The Supreme Personality of Godhead, Kṛṣṇa, is always situated within the core of the heart of the pure devotee, and He is always offered prayers by such worshipable personalities as Lord Brahmā and Lord Śiva. Because Kṛṣṇa embraced Pūtanā's body with great pleasure and sucked her breast, although she was a great witch, she attained the position of a mother in the transcendental world and thus achieved the highest perfection. What then is to be said of the cows whose nipples Kṛṣṇa sucked with great pleasure and who offered their milk very jubilantly with affection exactly like that of a mother?
These verses explain how devotional service rendered to the Supreme Personality of Godhead, whether directly or indirectly, knowingly or unknowingly, becomes successful. Pūtanā was neither a devotee nor a nondevotee; she was actually a demoniac witch instructed by Kaṁsa to kill Kṛṣṇa. Nonetheless, in the beginning she assumed the form of a very beautiful woman and approached Kṛṣṇa exactly like an affectionate mother, so that mother Yaśodā and Rohiṇī did not doubt her sincerity. The Lord took all this into consideration, and thus she was automatically promoted to a position like that of mother Yaśodā. As explained by Viśvanātha Cakravartī Ṭhākura, there are various roles one may play in such a position. Pūtanā was immediately promoted to Vaikuṇṭhaloka, which is also sometimes described as Svarga. The Svarga mentioned in this verse is not the material heavenly planet, but the transcendental world. In Vaikuṇṭhaloka, Pūtanā attained the position of a nurse (dhātry-ucitām), as described by Uddhava. Pūtanā was elevated to the position of a nurse and maidservant in Goloka Vṛndāvana to assist mother Yaśodā.

(Srimad Bhagavatam-------10:6:37-38--------translation and purport).