She was born with cerebral palsy and wasn't expected to live long after birth. She also required daily physical therapy from her mother. When Jo visited the Bruno family, Mariah revealed that she wanted to spend more time with her dad. She had a few seizures during therapy when Denise held her.
She was 15 years old when she appeared on Supernanny. She and Samantha and Isabella have a niece named Noelle (Taylor's daughter) who is 4 years old.