According to the Internet: In X-Force #75, she showed up (with short pink hair) and mentioned living with a couple "girlfriends." There's a couple very subtle hints there, including her saying that Sam's "definitely not" her type, and her saying one of the girls knows she's a mutant and she'd probably be telling the other soon. Little things, but things nonetheless. Then Claremont decided to run with it in his Mekanix mini, making it very, very clear that she had a thing for Kitty.
Soon after that, she showed up in the second volume of New Mutants, where she was explicitly out (and Dani tried to hook her up with a local girl).