Rats totaled tenants car - Am I at any fault?

[Christian Allen]

I own a 3 family house with a driveway in an dense area of the city. Recently one of my tenants had an issue where rats had eaten through her car and caused enough damage that they considered it totaled (2019 Subaru ~$20k). I have done my best to put poison, traps, and ultrasonic noise makers to try to keep the rats away from her car but they are a problem throughout this part of the city due to it's location to a large area of restaurants and bars. 

The tenants has been trying to blame me for the damage to her car but I dont feel I am responsible since the rats are not living in the house and I have done all I can to remedy the issue.

Not sure how to help the situation, I obviously feel bad for her but it is a matter between her car insurance provider and her, correct? Do I share any fault?