Assuming you have fully comp insurance, there are two possibilities:
1. She claims for personal accident. AFAIK, liability is irrelevant, fact is that she was hurt due to an accident involving a car and so can claim some money from her OWN insurance. The amounts are never huge, probably a few hundred quid. The idea is that this will pay for immediate bills.
2. She makes a claim against YOUR insurance, on the basis that you caused the accident, and therefore you are liable for the costs of returning her to as close as possible to the state she was in before. This would cover the cost of all the best medical care, loss of earnings, etc. Lots of money. The tricky thing is that you would need to show that (a) the accident happened due to your own negligence, (b) your motor insurance policy covers you while you are doing some repairs on the car rather than driving it. Both of these I suspect would be tricky.
I think your best bet is to check third party liability insurance included with your home insurance.
To get anything other than a fixed benefits claim, she will need to reach the position where you are legally liable for the injury that she has sustained, and in this case I cant imagine that any of your insurance providers will be keen to concede that.