State Of Illinois Child Support Issues

by D Roman
(Illinois)

My ex girlfriend and I had a baby (so I thought), she left me when she was 2 years old, when we were going to court to settle child support, she told the Judge the child wasn't mine and it was noted, after 13 years I get a call from her mother that my this young girl needs help because her home situation is dangerous. I don't know what to believe is she my daughter? I don't have a problem taking a DNA test and if this young lady is my daughter I would hesitate to take care of her my concerns is will I be held accountable for arrears in child support if it turns out she is mine.
Thanks