Is your DD at a state or private school? In England?
For state schools in England, there are SATs in May of Y2 and Y6, and the scaled scores for those are as you described (min 80, 'expected' 100, maximum 120).
There are no such statutory tests in Y5, although schools will do their own internal assessments each year. It's possible your DD's school has given them a Y6 SATs paper a year early, to see where they are at presently?
I don't know anything about CATs - I only mentioned those because they are often mentioned on this forum.
Without the context of what the tests are, what type of school your DD goes to, what sort of extra help she is getting and why, it's difficult to offer any suggestions. However, 10 minutes per day sounds like a manageable amount that is hopefully helping to consolidate on her learning at school and helping to close the gap with her peers.
Well done for getting her reading to you. Does she like no fiction at all? Does she read to herself, for pleasure?
Regarding whether or not to do any work over the summer, perhaps you can have a chat to her about what she would like to achieve in Y6, and what she thinks would help her to achieve it. If you come up with a plan together, she might be happier to do it than if you just impose a plan onto her.