Does linux support from manufacturer really matter?

The tuxe laptop convertible may seem nice and if she wants to draw on the screen then you are going to be limited on other options. But I would be worried about that intel gpu.

If you want to do 3d modeling you will need something that is gaming grade. I would rather game on a crappy card than model using one. But i also confess i am not up to date with the last few years of developments in that space.

In my very humble experience with digital art a proper dedicated drawing tablet beats any kind of touchscreen drawing.

So if you comfortable installing a chosen linux distro from a usb. (It really is not difficult, ai and YouTube can guide you trough it) and she is not already adept at touchscreen drawing i would suggest:

Lenovo Legion Both my partner and their mom have one with a different graphics card. Most of this line have nvidia rtx cards and all of those will do the job. Naturally more expensive models will have newer/faster cards.

Wacom intuos i am biased to call wacom tablets great because i have never used any others. I can say the intuos line is much nicer then the older bamboo pen and touch/fun line. Models come in different sizes