Any extra support you can get for your little girl would be great for her, I think you will know more once she settles in. Our school uses the PP+ for extra hours for the TA's so any child that needs extra support can get it, so I don't think that one 2 one sessions seems unrealistic or they could schedule time every week with a SENCO, so your little girl has a person who can support her regularly throughout school with whatever.
One thing our school does instead of the traditional parents evening are observation weeks. Where they will really focus on observing a few children each week and then they invite the parents in to discuss areas of strength/weakness. This has helped us to support learning better at home.
When my lad was in nursery it was obvious he was behind his peers for sounds/reading/writing, and to be fair when last September came I was just relieved to get him through the door, because he was very anxious. I am not trying to minimise your concerns but your little girl sounds ahead of where he was before he started. Up until Christmas he did not hold his pen properly, and I too was concerned that he wasn't getting the attention he needed. But school have 30 kids to deal with, so I think as long as you know what they need to focus on (by keeping open comms with the school) you can do a little at home to support. By the end of January he held his pen like a pro.
School have since said...he is a little behind with his writing...after what he has had to deal with in his life, I think that is bloody marvellous!
Reception for my boy has been much more about friendships/conflict resolution/patience/working together/kindness - and his first school disco! rather than reading/writing (although they have done that in buckets loads too). He won a headteachers award for 'Being a good friend" - he supported his friend when his friend was scared of having the flu vaccine. I thought it was lovely that the school recognised this rather than just the usual academic ability.
...and his attention span is approx 20 minutes, 31 seconds - I think it is no coincidence that cartoons/TV programmes/BBC bitesize lessons are often 20 minutes. So throughout lockdown, we have done just 20 mins max reading/writing at a time, then play.
All the best with it, you are right to be concerned and opening up the communication with the teachers now about what is possible will help settle your worries and hopefully make for a good working relationship between you and the school, but please do not overly worry (I know easier said than done).