Estranged relatives.

Ive been estranged from a sister since maybe 2020ish after a big falling out. We used to be close when our parents were alive but after they died it exacerbated some already existing problems and we haven’t spoken in about 3 years. We had some friends in common and now when they ask how my sister is doing or what she is up to, I never know how to answer. I don’t really wanna air out dirty laundry or invite discussion about it. I also don’t wanna embarrass them for asking - Even extended family doesn't know anything about it and I don’t really wanna tell them either.

Whats a clever way to navigate to this awkward situation?