Giving her nothing is fair. She would have paid rent elsewhere anyway, plus you gave her a good deal it seems. She's already had a "fair" deal.
I also moved into my ex boyfriends home many years ago. I helped him pay the mortgage, also helped him renovate (financially and physically). His home skyrocketed in price due to timing, but when we broke up I never even gave a thought to if he "owed" me anything. It was my choice to live with him, in his house, even to help him fix it up. He made a smart decision when he bought the house for a good deal, why should I profit? Anyway, just my 2 cents.
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