IT, I think you're looking for a problem when there isn't one. Every relationship, be that friendship or partnership, has a balance. We take things from a relationship, and we give in a relationship. A completely selfless partnership is not a possibility as we fall into partnerships and friendships because the people make US feel good.

She enjoys your company and she enjoys being able to say she is in a relationship with you. That isn't being selfish. Yes, of course she continues these things because it makes her feel good, but it's rare that she would carry on just to suit herself. Why would she spend time with you if she were just using you for a label? Why would she bother getting intimate with you if she didn't want to?

I have seen so many relationships hit road blocks because people look for issues that aren't there. Mostly because there isn't a lot of open communication about feelings in terms of the relationship. Have you really looked at the partnership and came to the conclusion that she gives you nothing? Or are you searching for an issue where there isn't one? I am not saying this to be cold, I am saying this because I have been in relationships with people who have done this and instead of opening a discussion about it, they created all of these problems in their minds then exploded on me with these "issues" I was not aware about.

What more would you be looking for? I have a feeling if you're giving her moral support, she also returns it. Partners can't give proverbial limbs to one another, or become each others solar systems, it never ends well. If you feel it's unbalanced, you need to speak with her and nip what ever it is in the bud.