I would talk to her if I were you, KP. If you're wrong and everything is healthy, well, no harm done, but if you're right then maybe you could really help her. Just take her out for coffee and lay out your concerns in the most respectful way you can.
The major players. Me, 30ish bi female. Gia, girlfriend of 4+ years. Clay, boyfriend/dom. Davis, ex/friend/"it's complicated." Eddie, roommate & fwb.
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. Liam, Eddie's husband.