Angel, it is important to get to 0 extension so that your quad muscle works properly. You can sit on a bed with your knee out in front of you. Put some gentle pressure on the knee, pushing it down. Once it begins to extend, you can add a little weight--even an ice pack for instance and gradually stretch that area. It took me about 4 months to reach zero, you have time, just work consistently on it.
115 at two months is very good. My doctor told me that I would gain as much as an extra 10 degrees in the first year. so, don't compare yourself to others and don't be impatient. jGentle stretching is the way to go.
I used to rock in a rocking chair and allow my leg to bend===try it is fun.