Approach Katyayani not for material gain, but as a means to reach Krishna through sincere devotional service.Listen — Srila Prabhupada Uvaca
Prabhupāda: ...approach Kṛṣṇa. Not that dhanaṁ dehi, rūpaṁ dehi, bhāryāṁ dehi. [give me wealth, give me beauty, give me wife]. Hmm ...not for material benefit but for getting facilities to approach gopīs they worship Kātyāyanī for getting Kṛṣṇa as a husband.
So we should follow. Siṁhavāhinī. sṛṣṭi-sthiti-pralaya-sādhana-śaktir ekā chāyeva yasya bhuvanāni bibharti durgā icchānurūpam api yasya ca ceṣṭate sā govindam ādi-puruṣaṁ tam ahaṁ bhajāmi [Bs 5.44] She acts according to the order of Govinda. Therefore to approach Govinda, if one prays to Kātyāyanī, it is very helpful.
Prabhupāda: Yes, servant of Rādhārāṇī, maidservant. [end]