I got a question

So I’m in a dilemma I want to invite my little sister to my daughters birthday party in august but I am afraid she will give my mother and other siblings the location to the party and I don’t want the rest of my family to attend her birthday party because they’ve made countless threats to harm my child, my husband and myself. I am stuck between if I should take the risk to trust her with this information. I feel bad because she’s been active in her life but she’s also extremely close with our family. I don’t let any of my family see her or receive any photos of my daughter. What should I do?