well theres protein in the fur right? or at least they lick their fur a lot and that would get saliva on it, i dunno.
She was never forced outside, if anything she was forced to be inside a lot by my sisters who liked to play with her, she loved being outside and would cry at the door all the time until some1 let her out which i did because it suited me just fine, its not like she was some dumb inside cat that didnt know about cars, a few months ago she had an injury to her back legs from a fight, my guess is she wasnt as fast as she thought she was and miss timed crossing the road.