You might have to go back to step one and start TT all over again. Everytime you think of it send her to the toilet, if she protests tell her that she needs to go when told until she starts not wetting her pants again.
Sometimes it's because they are stubborn, to busy, to lazy, have an infection, attention etc.
Is there anyway her kinder teacher can say something to her. Then maybe keep her home one day if it keeps up. If she doesn't like going then this won't work.
Sometimes the last resort is back into nappies and letting her stay uncomfortable. This can work with undies but with winter here alot harder