I think my teenage sister found my vibrator and I have no clue what to do, any advice
lol how young is she? If she's an old-enough or mature teen, then act normal as if you didn't do anything wrong (because you didn't do anything wrong!)
Could be a good time to sit down and have a talk about these things, if you have that kind of relationship. It's not some dirty little secret, many (possibly most) women have one.