Babies take naps

my "sleeping" princess

Delightful Finch is having some potty trauma.  It started around Christmas time...and it's getting worse and worse.  After being completely potty trained for a month, she's having accidents without realizing it.  She's terrified of some (but not all) of the potties in our house.  The scary toilets rotate a bit.
I put her back in diapers...but she still tries to hold everything in til she can go potty.  So, we have to take off the diaper for potty breaks at various intervals.
No fever, no pain. Trying to get her to drink more water - with some success.  However, it hasn't changed anything.
I can't figure out what's going on with her.  Any ideas?