I can't see Baxter having any romantic interest in Thomas. She is more of an older sister (she really isn't old enough to feel very maternal) who over time comes to care about him a gret deal. She has her own checkered past, made stupid mistakes which she now regrets and she knows what it means to live with a stigma and to have to reinvent herself after being an outcast or at least someone with a big bad secret. She can relate to his problems and issues. She also starts out feeling like she doesn't deserve love and happiness but slowly makes peace with herself and her past. She senses Thomas' despair and acts instinctively when needed to rescue him.
I am not a great fan of Moseley, he can be kind but it never quite feels entirely genuine to me, more like he does nice things for people to reap a reward. Maybe I am unfair but he blew it inmy mind the last but one episode. Shortly before Thomas attempted suicide he and Baxter had a short exchange during which Moseley was present. Thomas after making a remark that clearly showed the depth of his despair, as usual, brushed Baxters question off with some curt remark and walked off but it was obvious that he was desperate. Baxter wants to go after him but Mosley said "let him go" as he walked away. I was screaming at the TV "no, don't! Go after him, talk to him" (I otherwise rarely scream at my TV set, really!) It seemed - in the language of the show - rather unkind if not ghastly to keep her from going after him trying to help him. He blew it. Big time!