She should not be talking to anyone but her personal insurance company, period. Insurance companies get paid to deal with this stuff and figure out who pays for what. You let them settle it between themselves. It's possible but unlikely that her insurance company might then call you asking for the money, but realistically neither she nor her insurance company is going to sue for $200 in rental charges. The last thing you want to do is be exchanging money under the table behind the insurance companies' backs. For all you know, her insurance is ALREADY paying for her rental!
You should probably call your insurance company and tell them she was hitting you up for money, just so they are in the loop.
And last but not least, I'd highly suggest more than $25,000 in liability. $100,000 for a start, especially in an age where even a mid-range German car costs well over $50,000.