C.C.
You are doing the right thing. Try giving her a good snack before 10:30 and then let her sleep as long as she wants. Wait a week or so and make it 10:45, then 11:00. Eventually you will be able to do lunch at 11:00, then she'll take a long nap. It takes time, so try to be patient with her. Also, for now put her to bed a little earlier at night and give up on fighting her about the afternoon nap. Maybe she just doesn't need it then.