What can DD 13 wear - dress code is Indian

[parietal]

DD is 13 and has been invited to the birthday party of friend whose heritage is Indian. Dress code explicitly says "Indian".

What can she wear? She is a skinny blond kid and is not into fashion at all. Normally dresses only in jeans and t shirt.

Does she have any leggings and long tunic tops? Or leggings and wear a dress over the top. Maybe accessorise with some Indian style jewellery - obviously don't spend much but some cheap bangles etc.
You can buy bindis (little gems, you put one on the forehead) in loads of places https://www.etsy.com/uk/listing/476539720/110-colourful-gem-stunning-indian-bindi

She has no dresses. Might wear a t shirt or top with sparkles or decorations.

What shop should I look at for that?

Etsy will have tops she can wear with jeans. Amazon too. Search for Indian kurta/kurtis.