As long as you have something she wants, you might be able to use that as influence. If she's just 6 miles away, maybe you could take the laptop to her (even with the broken keyboard), or she could come and pick it up.

I work with people with developmental disabilities, and some have wonderful manners and pretty decent social skills, while others fight and always have to get their own way no matter what. I'm teaching "assertiveness" to a couple of ladies with IQs in the 50s. Mostly the part about respecting other people and being assertive, not aggressive. They can do it when they are calm, but forget when they get upset about something, so far. I have hope that if they get enough practice they will be able to use it more and more, even when angry.

If you indulge your daughter, regardless of disability status, you will enable her bad behavior. You need to set clear limits and boundaries that protect you. That will also at least give her an example of clear boundaries. So practice assertiveness yourself and keep yourself safe. I hope that she will come around and realize that what you have to offer is worth something. It's hard to give up being overindulged though, and even more so if she lacks the ability to see how it really limits her in life.

TC,
Rap