The 1st gen 12.9 is a big old unit definitely, but again it’s only ever used in house.
Wouldn’t have a clue on multi tasking! Literally she uses the absolute basic on it I’m not joking.
Doesn’t do any media, music, video, YT, probably got 3 apps on if that!
It’s just the convenience of it over a laptop, and knows iOS as has an iPhone (which also is so under used for anything!), to take around house and instant on etc.
The standard iPad would be great, over specced for what she’d need, it’s just the screen size as it’s only device she uses.