NOTE. Mother Sītā, being Lord Rāma’s internal potency, here demonstrates her natural fearlessness. This quality is a requirement for sannyāsīs:

A brāhmaṇa is considered to be the spiritual master of the three other sections of a society, namely, the kṣatriyas, the vaiśyas and the śūdras, but a sannyāsī, who is on the top of the institution, is considered to be the spiritual master of the brāhmaṇas also. For a sannyāsī, the first qualification should be fearlessness. Because a sannyāsī has to be alone without any support or guarantee of support, he has simply to depend on the mercy of the Supreme Personality of Godhead. If one thinks, “After I leave my connections, who will protect me?” he should not accept the renounced order of life. One must be fully convinced that Kṛṣṇa or the Supreme Personality of Godhead in His localized aspect as Paramātmā is always within, that He is seeing everything, and He always knows what one intends to do. One must thus have firm conviction that Kṛṣṇa as Paramātmā will take care of a soul surrendered to Him. “I shall never be alone,” one should think. “Even if I live in the darkest regions of a forest I shall be accompanied by Kṛṣṇa, and He will give me all protection.” That conviction is called abhayam, fearlessness. This state of mind is necessary for a person in the renounced order of life. (Bhagavad-gītā 16.1-3 purport)