£10 make-up gift for teen?

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I've got a 'main' Christmas present for my 14yr old niece and want to buy an additional present of around £10. She's obsessed with make up, studies all the YouTube videos and practices for hours, and she's good at it - her make up always looks appropriate (for her age) and stylish - actually I'm quite envious

So the additional present should be make-up based. What would you suggest? I was thinking:

MAC voucher
Palette - but what brand, eyes, lips???
Brushes

What would you buy?

Real Techniques core brush set are on sale at Amazon today for £8-ish, usually £20+. Sorry can't link as on my phone.

Makeup revolution "life on the dancefloor" eyeshadow palette. £10 each, four to choose from. I recommend the gold or rose gold ones; trendy colours inside, good brand reviews on YouTube etc. And the package is sparkly.

If you have time go on YouTube and look at imogenation one of her hauls. She always gets the mainstream drug store stuff and her audience are young.

She always says the now stuff to have.

She puts the product lists and links in the description too so you don't have to watch the video.

The Sleek free gift (with purchase of £12) is so cute , I was tempted to buy it myself for travelling .

My DD is 15.6yo and loves UD, KatVonD , Laura Mercier and TooFaced.
I'd buy her a voucher to put towards something then at least she's got the bulk of it paid (I have no clue what my DD would want me to buy her).
Possibly brushes or a Beauty Blender or a Laura Mercier powder puff? (But all £10+ )

if you go into superdrug they usually have one of the brands where if you spend £10 or £12 you will get a free palette. Revolution is a fairly cheap brand but pretty good too, and they had that deal going on last week i really needed 3 lipsticks and some umm banana baking powder and i got the palette for something like £14 but it was quite a few items for the price.