I'm hoping this is not a case of like mother like daughter ...
I have a very capable able DD who was projected to get A/A's virtually across the board 18 months ago ...now it looks like she will get 5 A/A's and probably the remainder in B's and maybe a C in one subject (or new 1-9) equivalent....she's pretty strong on all the sciences but lost her way a little in Maths (although recoverable).
It's the same scenario in everything she does - Piano - has the ability but scrapes by with a pass in exams....
I guess she's just not focused enough, doesn't have the passion or maybe even the self belief that she can achieve more ...I was much the same at her age ....so is it too late to change this attitude - she's YR 10 going into Yr 11 ?