How much money should be on a gift card?

My best friend's birthday is this Saturday. I wanted to get her a Forever 21 gift card, but I don't know how much to get her. She's 13, and we've been acquaintances in the 7th grade, but we turned into best friends this year, so we've known each other for about two years. Should I get her 15 dollars or 20? I was planning on getting her a gift card, iPhone case, 3D origami bear, a jar of lucky stars (last two homemade), her locker decorated, a birthday letter and card (online as well), and Swedish Fish and gum. If I got a 15 dollar gift card I would be able to spend 15 on the candy and wrapping paper, but if I got her 20, I would have to work with 10.
Either amount works for me, but I'm just wondering what amount is appropriate? I can't exactly give her approximately the same amount of things according to my birthday, because mine is one month after.

20 is good then go to dollar store

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