"She said, 'I didn't do nothing, Leah went to the bathroom and put her hands in water when I told her to wash her hands,'" Grant told the television station.
Grant said she became angrier because her daughter was not tall enough to reach the sink without help, KSTP reported.
According to the criminal complaint, a doctor concluded that the child's injuries "were consistent with a dipping type injury, meaning the hands were submerged into hot liquid or water."
Since then, Leah has had three surgeries, including a skin graft, and may need another operation, the television station reported.
"My daughter is really suffering," Grant told KSTP.
Jiles was charged with assault in the third degree and child endangerment, according to the criminal complaint. If convicted, she faces up to five years in prison on each charge and up to $10,000 in fines, the complaint said.
Parents and workers at a different day care Leah often attended have started a GoFundMe account to help cover bills.