When it comes to any safety/crime related issues, it's always best to contact the local police department with all your questions, hear all there is to hear firsthand. If unfamiliar with the area(s) do revisit more than once and at different times of day, possibly chat with locals/neighbors. Real estate professionals are prohibited from steering, enticing a buyer to purchase/rent, or not, in specific neighborhoods.
Hi, I would read your lease agreement to find out what and if there will be any early termination penalty. It will also depend on the landlord, I would try having a talk with them. Another option is to help the landlord find someone new to take her place, this may help them agree.