[alpacassei]

Unfortunately 5 gallons is far too small for any hamster. Even though russian dwarf hamsters are smaller, they need almost as much space as a Syrian. You’ll need atleast a 40 gallon tank for her but bigger is always better. The Prevue I mentioned before is a good size for a Russian dwarf but you’d need to add overlapping or full level platforms because it’s a bit tall for a dwarf. You could also make her a temporary bin cage, the largest Ikea bin is cheap but a good size.

Her behaviour is pretty typical of a russian that’s in too small a cage. You’re unlikely to see any improvement without upgrading her to a more suitable home