There are two ways of looking at the money issue: 1) You could continue this way and it will set a precedence that she is okay with that amount of child support and maybe get more if it goes to court, or 2) You could look up online what her child support obligation would be, and give her the rest. I personally would choose door number 2 because she'll eventually get her money put in her own account and will then choose how much she feels you deserve...and she'll lowball you. Plus, you should probably be fair.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer