Girls, How to turn her down while she has her hopes up?

Anonymous

I have an absolutely awesome friend who is cool in pretty much every way. Unfortunately, that doesn't mean I'm romantically interested in them. However, not only do they have a huge crush on me, but the friend group we're in is actively trying to get us together. To make things more awkward, it's almost a Ginny/Harry situation because she is one of my best friend's little sister. I've already tried to tell her I am not interested but I botched it and made it seem like it was just a problem with timing, and so she has continued to be outrageously flirty in spite of it. I do like them as a friend, and I want to keep my friendship with her older brother, so what should I do?

Girls, How to turn her down while she has her hopes up?
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