Hi,
In the first instance I’d have a really open talk with her, no judgements, no talk of weight but more does she have anything on her mind. Try to work out why she feels she needs to hide the wrappers.
I’d make sitting at the table and having dinner non negotiable, if she has an eating disorder or is at the start this is really important.
I’d also look at her moods, taking into account hormonal changes. Is she moody, does she have friends etc.
From there I’d have a chat with school and see if they’ve noticed changes with friends and behaviour.
Finally, take her to the doctor ASAP, you are clearly concerned and you know your child best, so listen to your instincts.
My daughter is anorexic and I would not wish this on anyone, it’s pure hell.
I will add that I believe in most cases that by the time a parent suspects ED the child is probably already in its grip.
Having said that it may be just a phase, leading up to periods and so on, she is growing up and needs calories. I don’t want to alarm you but I do have experience of this unfortunately.
I am happy to talk by PM if it would help.