I get that you think that ‘blending in’ will help your daughter - but in reality masking leads to further problems.
i’m autistic and found that trying to ‘fit in’ just leads to failure and burn out as you can’t sustain being something and someone that you are not.
encourage her to embrace being her / the authentic, autistic wonderful women that she is.
will others bully her for that? - highly probable. Will they bully her for trying to be ‘cool’ - yes they will…
kids bully you no matter what - but the sooner you learn as an autistic to stand firm and be you - not try to be what everyone else wants you to be - the sooner you will embrace your true self and accept who you are.
masking leads to mh problems and always feeling you are not good enough as nothing you do makes you acceptable to others and the effort involved in trying is just so exhausting and fruitless.
best advice I ever got was to ‘be the best autistic I can be’ - I am not NT and trying to pass as ‘normal’ is doomed to failure… trying to be the best, authentic version of me is far better than trying to pass as ‘normal’ / NT.
please teach your daughter to be herself and to buy whatever bag / pencil case/ lunch box she likes… trying to fit in really doesn’t work,
get her a support system / therapy to help her accept herself for whom she is.
no one should live pretending they are someone and something they are not. If you were French would you encourage her to pretend to be English to fit in!? I think not.
embrace her autism and help her to become proud of whom she is and what she likes.
there is nothing good about being a sheep and following the crowd. It won’t work and then she will be more upset… and she will feel she has done everything ‘right’ yet is still not accepted. It will break her heart.
the ‘rules’ of teenage social convention are too complicated and nuanced for any autistic to ever replicate them successfully. .
Please encourage her to embrace her authenticity and to be the Unique and wonderful individual that she is.