@Violettaparma - thanks for replying, I'm kind of glad they are different in that way, it was getting a little spooky!👻
I've had a chat with DD this evening, and I now feel awful for not having picked up in this sooner, so I am really grateful you started this thread! Along with the things already mentioned, there are various signs, I think:
DD says if there's a lot of writing on the board, she won't attempt to read it, but will instead wait for the teacher to start talking about it and will then take notes.
If they're asked to copy down work from the board, she says she literally looks up and notes one word at a time and doesn't actually take in any information until she has finished and reads it back to herself.
She also told me that when she's reading, sometimes the letters appear to increase and decrease in size.
DD says that they did a 3 part comprehension mock exam at the end of last year, and at the end of the exam, she had only completed 2 of them. I can't believe no one told me at the time!
I feel so guilty for not picking up on any of this, we are super close and she and I sit down for around an hour each day and she will tell me all about her day, literally lesson by lesson, what they learned, what they discussed, who she hung out with at break etc.. I think I just put her poor spelling down to not reading much, because she has a great vocab, as she's always asking what words mean.
DH, DD and I have discussed and I am going to contact her English teacher (who DD loves) and ask him for his advice. School are really good and I'm hopeful of a helpful response.
Good luck with your endeavours, I'll try to come back and let you know how we fare.