The house looks good. I reckon she’ll move in. Put a smelly treat inside it that should tempt her in. Eg a bit of cucumber or cheese. Did you put a litter tray inside it? They usually use it if it’s inside a big house. I put it in the back corner opposite the door as the other end is darker for nesting.
I have tended to avoid ladders mostly because of the space they take up - and partly because they’re difficult to secure on a shelf and are hard if landed on (eg if the climb to the top and fall). I’ve used a large cork log before - it works well. You put it next to the shelf or partly under it and it makes a ramp up to the shelf plus a nice big tunnel as well. And leaves a lot more floor space. You just adjust the height of the shelf to the right height next to the log.
In Moo’s plaza I do have a wood ladder with rungs but I stuck hemp mat on it so it’s softer if fallen on. It’s also at quite a shallow angle. But you wouldn’t want your shelf much lower as you have the house under it.
Another thing I’ve used instead of a ladder is the cokoured bendy bridges that screw to the bars - they make a very secure ramp - it takes two of them to be long enough. I’ll link them. Had a bad experience with a ladder in our robo’s cage as it wasn’t made for the shelf and fell down a couple of times and he couldn’t get to his water bottle.
The cage looks nice - maybe something to fill some of the open space on the left would give her more interest as well and make it cosier. The rat sputniks make good overhead cover and another hide to sit in. But as that cage is tall they either need to hang next to a shelf or tie a tunnel to the roof from the shelf so they can get into the Sputnik.
Have a look at some of the other cage set ups for ideas
. Luna has some videos on the Savic plaza. I have a big flat roofed house at one end and a wood shelf at the other end. So both ends have overhead cover- and the wheel in the middle. I’ll add a photo later when on my computer.
But as you say you don’t want to change a lot just yet while she’s settling in. You could add the odd new thing - they find that interesting usually - but best not to start moving things just yet. I reckon adding a cork log in the middle just in front of the shelf would fill the floor space up a bit, provide a ramp up to the shelf and also give some overhead cover as it’s a tall tunnel. And an interesting texture to climb over.
And then see how she goes. Bathtub taking sounds good too. Maybe every 2 or 3 days so she gets a break in between and can still settle into a routine in the cage.
They do tend to ignore everything I find - except things with food stuck to them! None of our hamsters have taken any notice of toys but they make a fuss if you remove them! It’s just part of the furniture to them.
Is the coconut hut on the shelf fairly stable sitting on there or does it move if used? They also like things to feel secure and not wobbly. If it does wobble a bit on the hard shelf then how about putting it in the substrate in the front left corner - they tend to really like coconut huts - Moo goes to sit in his to groom - it might tempt her over to that side of the cage more.
This is the cork log I’ve used. The Rodipet ones are the right size for a hamster cage - reptile stores also sell them but they’re huge long things.
https://www.rodipet.co.uk/accessorie...-diameter.html
The bendy bridges that screw to bars aren’t available at the moment - they’re made by ranch house cages and some smaller businesses haven’t got back to normal yet with the virus situation.