Hi Chonkers. Welcome to the forum
I agree with racing hamster. It just sounds like Mulan needs some extra time to adjust to her new setting. There are some great videos on youtube about taming your hamster from hopping hammy, chocolatecolours26 and there is one by Erinsanimals that is specifically on dwarfs so that may be really helpful! Give her about a week or so to settle and get used to her environment before trying the taming steps though.
Well done on being sensible and not just grabbing her like some new owners will. You sound responsible
Give her some time and slowly you will create a bond with her. Good luck!
P.S. Brilliant name!