Hi OP. I have two kids that have been through reception fairly recently and I still remember what the reception teacher told us before they started, about getting them ready for school
Play games with them like snakes and ladders. This will get them counting, and more importantly get them used to winning and losing.
Once they can count start to work on place value in everyday life. Like 'I have ten sweets, you have nine, who's got more to eat'
It's good if they can recognise the letters in their name. See if you can write them down and cut them out, and get them to colour them in and stick them down in the right order. It doesn't matter much if they can't recognise their name as their pegs all had a picture of them or an animal or something so they could recognise theirs.
Bud up fine motor control for writing - this can be playdoh, colouring, threading beads onto string to make necklaces, lego, sticking sequins...anything 'fiddly' that they have to concentrate on.
Practice following instructions especially more than one at a time 'go to the toilet and then put your shoes on so we can go out'
Practice doing coats and shoes etc and all the rest of their clothes if they have to get changed for pe at school
Read to them, take them to the library etc
Sure your daughter will be fine, she is only 4 and lots of countries with better educational outcomes than the UK don't start formal education til later.
I knew a few kids who could read and write before reception who were bored. My daughters nursery taught her to write letters...in a different way to how she learned at school so they had to get her out of all her bad habits! As it's not just about how the letters look but about how you form them, to get used to joined up writing in the future