Gender

I have began to come to terms with my gebder identity and do things to make me feel more comfortable in my own body. I bought myself a binder and I have to keep it hidden because I still live with my family. It was bad enough when I came out to them as queer, it'd be horrendous to come out again. I went to a friend's house overnight and I come home to find my sister has cleaned my room. I checked my hiding spot and the binder has gone. I still had the little gc2b slip underneath it and I found it in my drawer. The binder was put in the dirty clothes. There is no way she didn't read the card and find out what it was. She hasn't said anything to me and I'm terrified she will and I'll be forced to come out. I need advice.