50x30cm is very small so I'd look into connecting a larger one soon. Connecting a new larger cage is much easier on the hamster than moving them to a larger one. Another complete cage change would be too soon I think when she's already moved cages once very recently. Here are a couple of good options:
https://www.diy.com/departments/form...2763185_BQ.prd
https://www.amazon.co.uk/Really-Usef...2078458&sr=8-1
Her previous bin must have been very small indeed so I'm sure she's loving the upgrade.
Just saw your question about getting a second Robo. It is too late to get another one to join your current one as if you do keep multiple Robos they should be littermates that haven't been separated, but even then, many end up falling out and it isn't really recommended to keep more than one. They do fine on their own.