So please just normalise, have a routine. Peeing on yourself is no big deal, and just for once arrange for D to have a luxury bath, with gorgeous bubbles when she gets back from mums. Make it special for her.
Give her time and space. A new fluffy bathrobe and comfy cosy D and dad time. Perhaps some new pj's too.
One way you can help is hugs, big ones. After all dad needs a hug. Validate too, what a horrid thing foR someone to say to her etc........
Your home is an oasis of calm and peace. A lovely place to be.
Ask her what you can do to help with tooth brushing, is it the toothbrush? Paste? Does she have a favourite. What about a whizzyear brush?
Listen.
I did say hugs didn't I?
I am sure I did.
Breathe, you have time.
V
Freedom is just another word for nothing left to loose. V 64, WAW