A lease is a piece of paper. Yes, you CAN break your lease and move out, and she MAY then sue you for unpaid rent and other penalties. However, suing someone for breach of contract takes time and money, and most landlords will not spend the time and money out of their pocket, especially if you are towards the end of your lease term anyway. I would spend fifty or a hundred dollars and have an attorney write her a nice letter requesting her to stop the harassment, that you aren't paying for running over a stray animal which she does not own, (and even if she did own it, if you weren't driving negligently the animal was off leash), and that parking in the lot is a normal expectation when renting the apartment, whether it is in the lease or not. The attorney's letter, sent certified, is a good first step to have a judge side with you. Also, I would video tape all future conversations with the landlady as evidence of harassment.