Well, you don't really have to wait.. I mean, you could bring up the subject when you're alone with her. Okay, don't tell everythin, maybe she's a little young. But you could tell her like you have a girl friend who likes other girls, and it's okay, it's normal, and she's your friend anyway. When you'll be ready to come out, then you can tell her about you. That you love her very much, that it doesn't make you any different.
I think you shouldn't wait too long though... just in case your mom would have the time to make your sister disagree with homosexuality.
Hope this will help ! Good luck !
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