Her enclosure looks lovely

Is it all paper right now? I would leave it as it is. I am sure she likes the paper bedding. I am wondering if it's the divider. She might see it as two separate cages in a way and is doing what hamsters sometimes do - which is sleep near her beloved wheel! So she is sleeping in the end with the lower bedding, hence not digging. However not all of them dig anyway. So I think what I would try is
2) Pop a good sized house over the corner where she is sleeping - doesn't have to be a huge multiroom house, maybe a largeish carrot cottage or cardboard house then you don't have to worry about stilts, which would disturb her when she's sleeping. If she starts making a proper home in the house you could replace it later with say a two room one on stilts when she's not actually in it.
When you pop the house over the area she is sleeping, you could also put a pile of torn up strips of plain white toilet next to it, and she'll probably take some/pouch some and put in the house.
I'm sure she'd appreciate a nice cosy hide in that corner

Then if you like the hemp and have used it before, maybe just put a small amount in a dig box and see if she enjoys it.
But I wouldn't change all the bedding as that's more likely to stress her out. I am sure she enjoys and uses the entire tank at night and has just decided to sleep near the wheel! I am curious as to what the large moss covered item is on the right at the back (with the dish on top) - it's hard to see with reflections
Do you have a nightcam to see what she gets up to at night? Also which Amazon do you normally buy from? Uk or .de or .nl? I've set up our affiliate links to cover .de as well now if you need to link anything that's only in stock there. I'll set up Amazon.nl as well but I believe it's a bit newer isn't it so maybe doesn't have everything? The full range of carrot cottages only seems to be on uk though. This medium sized one could be good - it's a bit tall but could be pushed down in the bedding a bit so the door is lower maybe. Or - just make one out of a tissue box or small amazon box eg to get it the right size and cut a door
Rosewood carrot cottage medium (affiliate link)
It might be too big though really, and the small one is a bit too small to encourage sleeping in. But this Getzoo house could be good for that corner. It's a one room house but a decent size, and this type are very lightweight so you could just pop it on without stilts for now.
Getzoo one room house
What do you think? I suspect it's more about location than bedding.
