I think the other thing is, the substrate needs to be deeper - you'll need to keep it lower at the wheel end, but the rest of the cage you could have it at least 4 inches deep - it does a couple of things - makes them feel more secure and she can dig in it and burrow in it and bury things in it. Also she's less likely to find the base of the cage easily.
If you have a bendy stick bridge I would put it over her house entrance, to make a tunnel entrance - that makes the house darker inside and it'll also make a ramp up to the house roof. If you had the grass hammock in the middle she could probably easily climb into it from the house roof
They are lovely and light those cages, but the hamster may feel a bit in the spotlight and not very secure with a lot of open space in the middle and above. With deeper substrte they oftne push it around and built mountains and get things how they want.
I used to have substrate "sloping" up away from the wheel so it was deeper in the rest of the cage.
Also a big pile of nesting material somewhere in the cage helps - they need to build a really large nest to keep warm and constantly keep adding to it, especially this time of year.
Torn up strips of plain white toilet paper are best and safe if pouched or chewed. A big pile of that - maybe at the front of the cage - will also fill things up a bit and she can forage for it and take it to her nest. Don't put it in the house, they like to sort thatout themselves. When the pile goes down, add some more. If she has any fluffy bedding at all it needs taking out asap.
Having said that, normally it is best to leave their nest alone (unless it's fluffy bedding!). And just spot clean the pee area in the cage. The more substrate you have in, the less often it needs cleaning out. Clean outs really stress them so it's best to only do partial cleans and not too often. With the deeper substrate, the bottom half on most of the cage stays clean and dry. It takes quite a lot of substrate at first, but works out cheaper in the long run. Because you can go weeks without needing to change the substrate. And when you do, replace the clean half and mix it in with the new, so it still smells familiar.
By partial cleans it means - mainly just spot clean. Then do the substrate change one week, but don't clean anything else. Do the wheel a different week, and any toys a different week again. So something always smells familiar.
One thing that will make a hamster want to escape is - too much disturbance, cleaning, and anyone invading the house and stealing their nest and hoard! The nest and hoard can be left for ages, as long as they're not pee'd on. If they are pee'd on (they tend to grow out of doing that) then you have to replace it, try and leave a bit of old dry hoard and always put new food back in exactly the same place, and replace the hoard. They get very anxious about their hoard and nest. Likewise if you have to remove a pee'd on nest, try and keep a bit of old dry nest to leave behind so it still smells familiar. They will rebuild it from the pile of toilet paper strips.
The key is to let her settle in and feel secure and in control of her habitat, without too much disturbance. No cleaning at all for the first two weeks. Just spot clean the pee once a week (ie take a handful of wet substrate out and replace it with a handful of new and mix it in). You may need to start from scratch with the two week settling in period if you've done a cage clean.
Using a litter tray is brilliant. You put it where they have chosen theirpee spot (often a corner of the cage) and they use it. Have linked a corner potty I find good. You put Chinchilla bathing sand in it. Then just empty it every 5 days or so and the rest of the cage stays clean.
With a litter tray and deeper substrate, I go 2 months or more without doing a substrate change. And then the hamster gradually adjusts to it and gets used to it.
https://www.amazon.co.uk/Hamster-cor...=hamster+potty
Chinchilla bathing sand (must be sand, not dust)
https://www.amazon.co.uk/Supreme-Pet...a+bathing+sand
Some people use childrens play sand from Argos - must be sterilised sand.
Pringles tubes also make good floor tunnels - wiped out that is. Toilet rolls - better to slit them down the side so they expand.
If you wanted a new floor toy I really like this trio of balls - although I only use one of them - the hyacinth one. I find the wicker one a bit sharp and pointy. The sisal one I keep to unravel and use as sisal string for attaching things (eg a hammock!).
The hyacinth one is nice and soft - and you can stick pumpkin seeds under the folds - they spend ages trying to get the pumpkin seeds out. Sunflower seeds would do too. Might distract her a bit more.
https://www.amazon.co.uk/Rosewood-Bo...=trio+of+balls
Basically - fill the cage up a bit more with toys and substrate and a bit of overhead cover.