Was it any good? Did she thank you at the end, or was your performance sub-par, as usual?
Seriously, she has low self esteem. Just like a house that is infested with termites, sometimes it is easier to tear it down and start new instead of repairing the damage that is done.
We need a clear plan. You need to reduce this girl to
nothing. I am talking about so low that she doesn't even want to commit suicide because then people would have to clean up the mess. I am talking about a total recluse who doesn't speak unless spoken to, and generally communicates with a head nod while looking at her feet. To get her there, you need to be somewhat abusive. When she asks if she looks good, ignore her the first couple times, then tell her she looks like 10 pounds of $hit in a 5 pound bag. Get your friends to make fun of her. Start a website about how nasty she is.
Once she has hit this stage you may begin rebuilding her, slowly. Start with a good foundation. Teach her that if she does what you say, how you say, people will like her, just like an obedient dog. Teach her that she likes what you like. Tell her to put on makeup so she doesn't look like such a trashy whore. Most of all, tell her that guys like girls that put out. Try to get her in a gangbang and have all your friends be really nice to her afterwards, complimenting her, and buying her things. This is called positive reinforcement.
After some time, she will be yours, and she will be liked, because people like you.
Bitch.
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