CHICAGO (CBS) — A Missouri woman has claimed she is fighting a David-and-Goliath battle with the state of Illinois over her son, and she fears even when he turns 18 in two weeks, Illinois will still insist on custody.

It all began in the Spring 2014. Michelle Rider, of Kansas City, said she brought her teenage son to Chicago for medical treatment.

At age 4, her son was diagnosed with neurofibromatosis, a genetic condition where tumors develop on his nerves, ultimately forcing doctors to amputate one of his legs. During treatment at Lurie Children’s Hospital last year, hospital staff concluded that Michelle Rider had Munchausen Syndrome By Proxy. According to the National Institutes of Health, it is a mental disorder in which a parent or caretaker makes up fake symptoms, or causes real symptoms, to make it appear his or her child is ill.

Rider denied she has Munchausen.

“If it’s a crime to want the best care for your son, perhaps I’m guilty of that,” she said. “It’s been really hard. It’s been very difficult.”