Ordinarily a person after attaining knowledge of Brahman is not reborn.
But, the case of those who have a divine mission to fulfil is different. Those perfected sages have one or more births until their mission is fulfilled.
Brahma-Sutra 3.3.32 - Adhikarana summary: Perfected Souls May Be Reborn For The Fulfilment Of Some Divine Mission:
Normally liberated souls don't come back in any cycles but if they want they can. So, there is a choice.
Wherever he stays, he enjoys supreme bliss. The proficient in Yoga should practise these five Dharanas.
Then his body becomes strong and he does not know death. That great-minded man does not die even during the deluge of Brahma.
The answer is No. Vyasa says there are not inauspicious. In fact, a sensible man should worship her.
Kashi Khanda of Skanda Purana chapter 4 contains characteristics of a chaste woman. These are said by Brihaspati. These are again narrated by Vyasa.
After talking about duties and characteristics of a chaste woman, Vyasa continues to talk about duties of ...
Skanda Purana says so.
Skanda Purana, Vaishnava Khanda (Book II), Vasudeva Mahatmya (Section IX), Chapter 22:
Of all inauspicious things, a widow is the most inauspicious one. Her
sight or touch destroys the merit of men. (11)
If at time of starting on a journey one sees a widow in front, one
shouldn't go at that time. Otherwise death is certain....