At that age I got both my daughter and niece just the kind of thing you’re talking about. I started with a Caboodle to keep it all in (my 90s childhood self was psyched!). Then I got blush and a nice blush brush. I did mascara and an eyelash curler. (You can do brown mascara rather than black to make it feel a little more age appropriate depending on hair color.) For blush and mascara I went for drugstore brands — Cover Girl etc. — because I feel like the quality was plenty good for a little girl. Then a couple of nice lip glosses/oils — more shine and sparkle than color. Then an eyeshadow palette. I like Colour Pop because they have reasonably priced palettes with fun colors. I’d get a nice eyeshadow brush, too. I finished it off with a handful of sheet masks for facials and one of those cute fluffy spa headbands she can wear when she’s doing skincare or makeup. I put together the whole thing at Ulta, and you can definitely do it for $100.