refusing toilet at day care

my two and a (nearly) half year old daughter decided on Friday that she was toilet trained! We talked about it but i had not started doing anything yet. The entire weekend she was dry (no accidents!) she slept in nappies but otherwise two days of only knickers!

However she point blank refuses in her child care! The child that the child minder describes is not the same one I see at home. She refuses even to sit on the toilet and has accidents.

I do not want to stress her out but I also do not want her to get the impression that it is ok to be in nappies at the child minders long term.

Is this a normal transitional stage????