My friend likes being the only girl

So. One of my bestfriends likes being the only girl around guys. Not that she has ever admitted it or voiced it verbally, but she purposely excludes me and our other best friend from things because of it. I wish she wasn’t like this it makes me feel very used as a friend. Should I try talking to her about it? She’s been like this ever since I’ve known her and it’s really annoying.