Alright so to actually answer the question about Macs...
YES: I've been using MacBooks for years now and I'm well-versed on all the latest versions and features:
1. By "Graphical Work" do you mean "Design" or "Video"? Design isn't going to take up so much space... video is going to take up ALL the space. But basically you're thinking of MacBooks in the wrong way:
2. No one really (besides people working on photos) uses the main drive on a MacBook for storage. It's mostly to keep the OS and applications going. Most of the actual WORK for these computers is stored/done on fast external drives like the Samsung T5/T7 shield or larger (or faster) external storage solutions.
The M1 MacBook air I'm typing this on has 256GB of storage. That's the OS and whatever programs I have installed and that's IT.
3. Never pay thousands of dollars for more internal storage.
It's generally UNDERSTOOD, with Macs, that you're going to be using some kind of external storage. Previously this came in the way of Thunderbolt drives... now it's all USB-C.
4. Apple's M-Series of Processors are EXTREMELY powerful. I've had this M1 since 2020 now and have found no need to upgrade it. The most common CPU they have these days is the M3 (though the M4 already exists). It's roughly about 1.5x as fast as what I have... which was already pretty damned fast. Next up would be the M3 Max followed by the M3 Ultra. That's the fastest. (Unless they invent something new for the M4.)
Really ANY of those would be good enough to last your daughter for years.
I use far more powerful software than anything Adobe ever put out... and I have yet to be disappointed with my MacBook. (I also do a lot of 3D work now that I have a 3D printer.)
So, in summary:
A. I'd say a 512GB of any kind... even an Air... would be the sweet spot.
B. But the build quality is slightly better with the MacBook Pro line. Plus they have a fan... though you'll never need it. M-Series processors do NOT get hot. (I insisted on a 3-fan cooler for my RTX 4060 on my desktop PC... This was ridiculous for pretty much the same reason.)
C. Try to avoid overspending. These aren't the 2012 MacBooks that were built like tanks... Spending more money will NOT get you a better build quality. Apple's latest machines... from my 2020 onwards... are rather flimsy. So an M3 Max MacBook Pro or even just a regular M3 would more than suffice. If you get the Ultra? It's going to be the same build quality as the cheaper version.
D. BUY THE APPLE CARE WARRANTY! Something will, inevitably, go horribly wrong with your daughter's computer. Probably just after the initial warranty expires. You want Apple Care for when that happens. They will be absolutely merciless if you don't have it. $600 repair
$800 repair... Trust me: You don't want to put yourself in that situation.
That's about all. If you have more specific questions... Let me know.