Most of the girls I've known or dated that have a gay sibling, typically have issues with men and are a little crazy in general. I think it has to do with their upbringing. This may not be the case with all women with a gay sibling, but it's been the case with me.
I would date her like normal and if any red flags pop up then hit it and quit it.
I would date her like normal and if any red flags pop up then hit it and quit it.