Catch 22
I am just a law student but my understanding is that you are out of luck. Since the owner of the car had the car insured, she is responsible for the car and who she lets drive it, so your limited tort would apply. Though you now have 2 people to go after. On the flip side your own policy would still pay for at least the first $5,000 of your injuries and if the owners liability coverage is minimal then you can go back to your own underinsured motorists coverage. Limited Tort is supposed to be applied to your specific situation. So for you, your injury may be considered a "serious injury". For an example, a stenographer may break her hand or fingers and couldn't work for 6-months because she relies on her hands for her job. Get an attorney to be sure, there may be a precedent that relates to your situation.