For the paper that was much lower than expected the school will know if it was across the board for all the pupils or just in your DCs case.
Was she predicted to get A*?
If it were me then I would also look how far she is up from a B and therefore how many marks she could afford to 'loose'.
Hopefully the school will get back to you soon.
It's always worth thinking through if marks aren't as expected but it's also good practice for the future to be able to move on from what are for her slightly disappointing ( but still excellent!) results and look forward to the next stage. I hope this issue hasn't stopped your DD from enjoying her success and she's still celebrating