ST said:
Sometimes you get a player who's really just along for the ride. (Obviously, she's there because her boyfriend is there.) The important thing is: There's nothing wrong with that.
Let me echo this sentiment. Back in college, I had a player who really didn't do much during the game, especially combat. It was actually bad enough that I had a couple of the other players ask me why she wasn't
doing anything. She was one of the people most gung-ho about getting together to game, though.
What she wanted was to just be around. She liked seeing the story unfold. She liked making (as opposed to playing) the character. She just liked being a part of something fun.
In my case, the player was a great cheerleader to the rest of the group. She was also great to include in backstory events and to catch plot hooks. The game flowed much differently, in a negative way, without her around. Would I want a whole group of players like that? Not hardly -- I think I'd kill them. But one was fine.
Your case sounds like she likes combat. There's nothing wrong with that. She could be having a fine old time over all. Ask her if she enjoys the game as a whole, then take her at her word. As long as she isn't bringing anyone else down and she's having fun, I utterly fail to see anything that even borders on a problem.
And, if the fact that she isn't particularly active bothers you, I wouldn't sweat it. My wife started out gaming because she had a crush on me (her words). She didn't do much other than roll dice for quite some time. The last month or so has seen her play her first spell-caster after a decade of sword-slingers, granted it's a cleric of Clanggedin.
Also, in every game she's played for the last four years, she's ended up as party leader. That's including the ones with other people who are "always" leader. I'd say she's really taken to gaming, but she spent a number of years as a wallflower, first.