Wow that is amazing. So glad she is happier. She clearly needed the extra space. IMHO I would now add a lot more enrichment to fill it up and give her plenty to do. Large cork tunnels are good - interesting texture to climb over and a big dark tunnel to run through. Different levels of substrate etc - lots to do and places to go. I'd also still go for a large house that is dark inside. The one in there looks ok but I'd pile substrate over the window and put a bendy bridge over the door.So it's dark inside.
And she looks so cheeky and adorable!
Edit - just noticed you still have the lief labyrinth house as well. If you're going to keep that then I would knock out the centre panel inside to make an area that's larger for a syrian.
This is a brilliant labyrinth house, but a bit expensive. I've used it for our last 3 syrians. And you can buy the legs/stilts to stand it on as well. Which means it sits on top of the substrate securely (without sinking and squashing them if they try and tunnel underneath).
Every hamster has nested in the front left larger compartment (it is darker as round a corner) and used the middle back compartment as a toilet - which is where I put the litter tray. Except for one syrian who used the right hand small back comparment as a toilet and landed in it every time he came down through the hole on top! They have all loved it and built large cosy nests and hoarded under the nests and in the little back compartment on the left. The right hand side is more of a "run" to the top entrance hole. No need for a bendy bridge over the door as it already has a double entrance door. The flat roof makes it a good platform as well.
Rodipet® Hamster House Maze DaVinci 41x26 cm, Ø 7cm
These are the slot on legs that fit it
Rodipet® Set of 4 Stilts, 6 mm to fit DaVinci line of houses