How hands on has her dad been before now? Was she in nursery, used to other children around? Is it a v big change, even from what you used to do at weekends?
I think the change is the hardest, we would never have spent this much time at home before, which in some ways is really nice but no grandparents, no parks, limited walks in the buggy has been a massive change.
We have a 17 month old and are splitting the day in two, working six days a week and evenings: so far she's taken to it pretty well but there has been a huge increase in breastfeeding also. When I'm there she wants to feed all the time, easily six times in a five hour period, when before it was strictly twice a day, first thing and on return home from childcare. We've had terrible nights since the weekend, we're thinking hour change might have contributed and also more screen time than she's used to face timing grandparents etc. Plus she's been unwell.
It's hard, and exhausting. We don't have a huge house but I hide upstairs so she doesn't see me and when I'm out of sight and she's playing with dad shes fine, but he'd always been v hands on and fun and she's used to time with him. I think the more routine the better: wake, snack, nap, lunch times. Could you start some new routines? Is anything comforting? Are there toddler friends you could try video calling with? It is a hugely unsettling adjustment for them, and a bad time developmentally for so much change I think.
It's v v hard, I guess all I can say is you're not alone and it will get better but maybe have a think about what routines you can swap on from nursery, and try and ride it out. But it does sound like she might be unwell which would be making it all worse.