Ex Is Mad

I have a child with a woman I was never married too. She enjoys playing games with me through my child. She asked for a modification about 12 months ago. I turned in all my paper work she turned in none the case was denied and they did not raise my support. I have had my child every summer almost all summer for two years. I also get my daughter 4 days one week and 6 the next. I am only court ordered to every Wednesday and every other weekend.I told the mother that i was not going to get her all summer just part. This made her very mad so she said she is going to have my child support raised. I am married now with two other children and a wife. I can not afford to pay too much more child support with out losing my home. What can I do so she can not continue to play these games through the child support.Can she file again even though she just filed 12 months ago.