Hi. I'm sure there will be someone along with more experience later, but my gut feeling would be that you should work with the school. They have raised their concerns, and I assume are still working with her in the classroom?
My youngest is in Year 1, (I have an older child in Year 4), and I would still be reluctant to hire tutors/Kumon/formal work at home for now. 5 years is still very young.
Honestly, in your position, I would make an appointment to discuss this with the class teacher, and ask if it possible to keep you informed (maybe half termly chat).
At home, I would play lots of games - Children's Monopoly, dice games (Shut the Box is simple and fun), snakes and ladders. That will encourage her number work without it being a chore.
Reading and writing - bedtime stories, spotting letters, simple Scrabble games. Keep a pot of pens and pencils, and loads of papers out and let her draw and colour whilst she chats to you.
I don't have experience of Dyslexia, so I'm not sure when it is diagnosed. I just think it must be best to keep her happy and enjoying learning whilst any other issues are sorted out.