I'd never go back to a store-bought or branded cage, after transforming a plastic storage box (80 x 50) into an amazing space for my hamsters, just by ventilating it. It's much cheaper and larger than 90+% of cages online or in shops.
It's better to have a bigger cage than one that's too small. Look into getting another asap (storage box cage being a fantastic cheap option). Hamsters often sleep in unusual places too, so try not to worry about that - just make sure she has a couple of places she can get cosy for bed. Give her more time to settle, but aim to get or make her a bigger cage