Don't stress about it! Parents all over the country (and the world) are finding new ways of working and supporting their children's learning. Don't worry about what you see everyone posting on FB - everyone knows that is not the true reality.
There are loads of 'educational' activities your child could be doing that require little or no input from you.
Jo Wicks does his daily workout but you could just get her to set up an obstacle course in the garden then time herself completing it. How fast can she do it? How many times in 5 minutes? Can the toddler do it? How quickly? Can she time in seconds and convert to minutes and vice versa.
Loads of authors are reading their books online - she can find her own favourite authors to listen to and can then tell you about them when you take a break or over a meal time. Set her the task of finding a great picture book read online to share with the toddler later in the day - she'll find loads. Look up kidsactivitiesblog for ideas.
Mo Willems (author of Don't Let the Pigeon Drive the Bus and others) is doing a daily Lunchdoodle - 20 minutes of talking about books and doing some doodles.
Shoo Rayner is a book illustrator who does fabulous online tutorials - cartoons, realistic drawing, drawing basics. We love the panda, especially.
Art of Kids Hub is a YouTube channel where a dad does an art tutorial alongside one of his own children. It's great for kids to see how things turn out okay even if they don't look like the original.
There is loads of other art stuff - take a pen for a walk is a good one to start with or look up a favourite work of art and there may well be a tutorial - hokasai's wave is fun.
Regarding maths - she must be in Y4 or Y5 - so working on quick recall of times tables will be helpful. Look up URBrainy MTC for a fun way to practise. Mathsframe is also a great way to practise maths - as is Khan Academy, which is free right now.
Spelling frame is an online (free) site for interactive spellings - I like it as it starts of basic and quickly works out what you are getting wrong - no need for an account.
There are loads of live zoocams which are fabulous ways to explore animals in their natural habitats. Some great ones (including pandas, whales, owls, bees) on explore.org.
Get her to watch Horrible Histories and see where she goes from there. She could choose something that interests her to research further.
primaryhomeworkhelp is a great starting place.
Get her involved in making dinner - or could she draw up a schedule or menu plan - this will all help with different aspects of maths. Get her to play with a bowl of water and the toddler - predict whether household objects will float or sink.
Get her to explore the house looking for all the things that use electricity - obviously remind her not to touch. Then get her to sort out appliances into whether they are mains or battery powered. Lots of stuff online to explore circuits and KS2 electricity.
Go to willowsmusical.com and sign in (free and just put in an email address) to watch the stage play of Wind in the Willows. It's a classic but great fun to watch. She could tell you about it in the form of a review.
Good Luck.