Does she have to visit the wife of one of her relatives?

No File Exists
Check below answers in case you are looking for other related questions:
Their aunt wants to corrupt them; should they cut off ties with her?
Guidelines on the relatives with whom ties of kinship must be upheld

No File Exists
Related Answers:
Advice: Separating women from non-mahram* men in family visits
Her husband’s sister is causing problems for them
Family Disputes
Their aunt wants to corrupt them; should they cut off ties with her?
Guidelines on the relatives with whom ties of kinship must be upheld

Recommended answers for you:
Does the soul come out of the body during sleep?
If she sees some brownish discharge after her period ends, should she pray and fast?
Fasting on the day of the Mi’raaj and the day of Shab-e-baraath
The true nature of insurance and the rulings concerning it
Why do we pray Zuhr and ‘Asr silently?