If someone parked at my house where they were instructed not to and I hit her car, will I be liable for that?

It was raining hard with small hail stones and I couldn't see the little grey car. When I started the turn the rain was hard enough that it masked the car and about the time I started to put it in drive I heard a pop. The end of my bumper caught the bumper below the taillight and pushed the bumper in where I had hit caving it in enough that the truck was hard to shut. After she went home and tried to pull the bumper out she pulled the tail light out turned it as well. Should she be at equal fault for deliberately parking where she was told not to because she didn't want to walk in the rain?