My mum has had a few call lately as someone is looking for my cousin regarding a debt. We also have an unusual surname so was easy to find. She gave out the details that she knew about and thought nothing of it. Another call months later so she asked why they were looking for him. Turns out he owes money in NZ and it sounds like he has also changed his surname to avoid being found.
They will eventually find her through a few avenues but it's really up to you if you want to give out her details. You are only responsible for debts that have your name on them not debt the other members of the family collect
Just hope your details are nowhere on any of her documents