So how long have you had this child? Have they always brought her in panties? Did they tell you she was fully trained? I am a little confused to how you got to this point.

Did she enter your daycare under the understanding she was trained?

Personally I would have demanded pull-ups after the first few days of accidents. I have zero tolerance for such disrespect of your home. You can steam your carpet all you want but ultimately it is ruined and will need replacing.