I get you. It's hard for the little ones. It's not easy to explain and it does make you feel guilty.
My five year old is showing signs of being bored/down/missing school etc now. She's more teary and emotional. We've been trying our best to keep things fun but it's hard.
I think it has helped to keep busy together. I'm not sure how old your child is but....
In the morning have breakfast and then let her have a bubble bath. Keep her busy for half an hour washing dolls hair. Making bubble teapartys. Playing boats. Let her try washing her hair etc.
Then try watching a film together or a program she loves. Things like the Wiggles on Netflix are fun and dancy. Or the little baby bum nursery times. Do some singing etc. Maybe have a cup of tea and a biscuit together whilst you do this so it's more fun.
. Have a picnic in the garden. If it's a nice day. Bath dolls in the garden. Wash cars. Do chalking on slabs. Colouring. Daisy picking. Look for ladybirds. Help her out leaves in a pot and make a ladybird house etc.
In the afternoons colouring, naps. Puzzles. Playdoh etc. Anything crafty. Let her have a sleep if she has one. Then hopefully you can get jobs done.
It's really difficult though. They are used to mixing and having fun.
Yes it's better than being at risk of this virus. But our kids are innocent and can't understand that. Ofcourse they will be fed up and bored.
Its hard for us mummy's too. Trying to do our jobs and occupy them and get some headspace is tricky.
You are not alone! Its really tough xx