@InDreamland have you looked at bubble tea sets? My dd loves these and is turning 13 in a couple of months. Bubble panda seem to be the popular site.
Other popular things for friends parties have been stationery, particularly pretty notebooks and journalling stuff, highlighters, moshi tape, scrapbooking set, that sort of thing! A bullet journal starter set could be a good idea with a couple of nice stencils or stickers
Bath bomb sets (bomb cosmetics or lush) similarly body shop is popular, or a soap and glory set - some good ones get reduced in the star gifts from about September
jewellery from accessorize, they have some lovely sterling silver bits or the cheaper ones!
skinny dip phone case- obvs make sure it fits properly on her phone though 😄
vouchers for h and m or new look- seems to be the only places dd shops!
A nice bag from new look or river island. Could get a purse too
fluffy socks, hot chocolate set and popcorn. plus a voucher for Amazon prime or sky store for a film?
A slushy making cup.
If she has a Polaroid camera or sprocket you can get a good set of mini frames and albums plus pegs and string that they can display them. Also film as it runs out quickly
Shortie pajamas or an oversized/cropped hoody (not a hoody that fits…)
her best friend likes the mini brand food creator things for making mini recipes
books/book vouchers. My dd loves Percy Jackson, in fact everything by rick riordan and the gone series by Michael grant. Other popular teenage series are heartbreaker, have heard lots about it!
12 year old girls seem to be my forte