Might get slated for this but here goes, to be fair, I have a daughter who is 4 too. She is extremely girly and obsessed with watching me put my make up on, loves putting her sparkly lip balm on etc. During lockdown, I did a face mask in the day, she had never seen one before and immediately wanted in. I didn’t let her on that one, but the next one I used, I popped a bit of nivea cream in a pot and gave her an old make up brush and she painted on her 'face mask' I know her skin and she was fine. We made an afternoon of it and painted our toenails afterwards.
Guess what I'm saying is, maybe not a sheet mask, but it isn’t the worst thing letting Daisy join in with Charl