Yes I also have Pax - the shallow depth. I filled it with shelves, pull out drawer/basket, and boxes. I have a separate free standing wardrobe for hanging things. In the pax, I cut off some of the shelves and added adjustable 'legs' from another item to make some taller areas (you couldn't just buy shorter shelves or frame dividers for the shallow depth at the time, though I think they have just started doing them). I can put jewellery trees and other tall items in those spaces.
For hanging things, I think the deeper ones are better, though, as with the shallow depth, you need the pull out hangers so that the clothes hangers go in sideways, rather than forward like a normal wardrobe, and I think I'd find it harder to see things that way. But if you don't have room for the deeper ones, you could still get that.
Or get a mix of the deeper ones where you need it for hanging stuff, and shallower ones elsewhere to maximise floor space, and if they are too deep, stuff gets lost on the shelves or you waste the space anyway, unless you have quite large items. the shallow depth is fine for folded up jumpers and tops etc.
Does she need a small double bed? Could you have a single, or one with space under, or a desk?
If the sockets are in the wrong place, you can cut holes in the backs of Ikea stuff quite easily, and then you can still access the sockets, and that can work for stuff that you might want in the wardrobe, like hair dryers, electric razors, or phone chargers, etc, that could stay plugged in (you could plug a power bar into the wall socket, and leave it on one of the shelves in the wardrobe, and then still be able to turn that on and off, if you were worried about leaving stuff plugged in for a long time).