Bit weird they've not contacted you really.
But anyway.
I teach year 4. A day in class might look like this for the main lessons:
Half an hour spellings - 10 min input, 15 - 20 min independent work
An hour maths - up to 20 min 'teaching', up to 30 min independent work, then a 'round up/answers/trouble shoot' chat
An hour of writing - up to 20 min 'teaching', up to 30 min independent or group work, some edit, some marking, some whole class feedback
Half an hour of reading - sometimes just listening to the whole class reader for half an hour, sometimes a 15 min input, 15 min independent work
An hour of another subject in the afternoon - as above, around 15 min input then independent activities/tasks
So that's about 2 hours actual independent work. If they are 'learning' from reading a text book, then doing exercises, 2 hours is plenty.
The rest of the school day right now would be breaks, lunches, listening to stories, sharing work, singing, assemblies, hand washing, PE, circle time, sessions for editing or responding to marking etc.
I genuinely feel that the DfE hasn't got a fucking clue what goes on in primary schools really. The chat around Newsround, or around a poem, or around a random comment made by a child might take up half an hour and provide more learning than anything else that day. These conversations might lead to a whole load of unstructured learning during the week as children do their own research, come in and tell us something else, the teacher might pick up on a specific interest and run with it a bit. This is the stuff that builds teacher/child relationships and is a huge part of primary school life.
If I were you I'd investigate Oak National Academy properly - if I had a year 4 child now, working broadly within age related expectations, with no input from school I'd do these units:
classroom.thenational.academy/units/journalistic-writing-based-on-traditional-tales-0887
Writing, grammar and spelling are all in there, do one or two of them a day.
To support this, I'd sign up for the free stuff at First News: subscribe.firstnews.co.uk/free-downloadable-issue/
Start at Spring Week 1 at this link for maths:
whiterosemaths.com/homelearning/year-4/
Then I'd download this stage 4 reading pack and do one a day.
www.literacyshedplus.com/en-gb/resource/stage-4-reading-packs
I'd watch Operation Ouch on CBBC at 11.35 every morning, then do this science unit:
classroom.thenational.academy/units/human-anatomy-f968
Loads of that can be done independently. She'll need a lined notebook and ideally a squared notebook.