I would suggest that you just need to hang in there. Start your normal routine through the screaming. Offer comfort and offer to play with her while you're down on the floor, but honestly, she may just need you to back off and let her figure things out. It's only been 3 weeks. I've had 12 month olds scream for 3 weeks straight crawling to the front door. Then they magically stop.

Especially if the family is good and on board and she naps well.. I'd just plug through.

Every day may help, but I think you'll just run into a similar problem when they go back to 3 days a week. She needs to get used to the schedule.