She can sue you for damages for up to 2 years (in most areas)...however, the strength of her case goes down dramatically, the longer she waits.
Your insurance company (the carrier with a policy in effect at the time of the incident) is still responsible for paying whatever damages she's awarded (provided it's the right kind of coverage). However, they are more likely to fight it after so long, because her case is not as strong. Basically, she might have screwed herself already.
If the damage/bills/etc was paid for by her insurance company, then THEY might come after you, since they may claim it was YOUR fault. That's called subrogation, and it's the Ins Co's way of getting back the money they paid out, since it was not the fault of their insureds. It's really the process of suing you, and seeing what they can get, either from you, or from your carrier.