It sounds like you want her to come out far more than she does! Maybe she’s not gay? Maybe she is but doesn’t want to have a big ‘coming out’ conversation? Maybe she’s waiting until she’s madly in love until she does? Who knows?! The point is that it’s her life and her decision to speak about her sexuality if and when she wants to. As long as you’ve been openly non-homophobic in front of her and she knows you love her whatever her life choices, then I would let this be. She’ll speak when she’s ready and I’m sure you’ll be there loving her when she does.