Car Accident Issue, They aren't leaving me alone Options

[MaskedMan]

Alright, so lately i've been stressing out a lot, and i really need help here. I was involved in a car accident about few weeks ago when i car hit me from behind pushing me into the car ahead of me. I damaged the car ahead of me a lot and the car behind me drove away and we didn't see who it was. We didn't file a report, and we agreed to handle this outside of insurance. I ended up paying $2,000 and had her sign a paper saying that i had paid her and all payments and concerns are complete. But now she is calling me, telling me that her insurance company wants to charge me for all kinds of stuff like medical and therapy and stuff. I guess she decided to go ahead and call her insurance company either way without telling me on the day of the accident. Can her or her insurance company do anything to me after i paid and she signed the paper?

[MaskedMan]

My co-worker told me to get a lawyer, but i can't afford one so that kind of sucks. But if i'm going to end up paying a lawyer thousands of dollars anyways, then it's not even worth it to get one becuase of all the time i'll need to go to court and take off work. And i don't want to make this a big deal, i don't want any money out of it, i just want to be left alone. The $2,000 was nothing, i don't care about that anymore. Yeah it was a lot of money, but my car is fine, I'm fine, it could have been worse so im fine with that. But dude, this **** is so lame...