Okay so I am 19 (F) and I have two younger siblings who are now 17 (M) and 16 (F) 
My sister is now sending me death threats and is threatening to sue me in two years for what I did when we were younger 
The thing she is referring to is when we were little, my sister and I shared a room. We would be in there a lot. When we I was in elementary school I didn’t know anything about sex or what it felt like, I just one day found out that something felt good. When I was alone with my sister in our room, I would be on her back running her back but also humping a little bit. This happened a few times then I stopped when I did some research. I never spoke of it and neither did she. Now, my family had always been pretty toxic and prone to argue, so there have been some heated arguments and accusations. Now that I have moved out, my sister has not spoken to me much, since my family and I disagree on who I date, but my parents still support me. My sister is very angry at me all of the time though, and she says that she and some of her friends want me dead for this thing that apparently I “molested her” which I am not really sure if I did? 
Now she is saying in two years she will testify against me in court

can you guys please help and give me some advice or whath I should do? Did I molest her?