I’ve been thinking about ways other than more tubes & hides you could adapt your cage a bit without too much disruption now she’s moved in to make it more suitable for a Chinese as they are quite different in many ways to other hamsters.
They do have a tendency to block tubes so make sure she has access with some sort of ladder or ramp in & out of the sand area, she’ll probably try to climb in or out anyway as they like to try & climb everything.
I know I suggested it before but I would move the water bottle & put it on top of the house, if she does dig in the sand she might knock it over where it is now. I would add a water bowl on top of the house too, they seem to prefer a bowl to a bottle although it’s best to have both at first just to see, something really small like a tea light holder is fine.
I was wondering about the ceramic hide (vase?) as that’s probably quite heavy & she’ll be likely to dig underneath it.
For sand they really do like a round enclosed sand bath, if you moved the water bottle you might have room to put something on top of the existing sand, not sure if you’d have the space but they absolutely love the Hagen bird bath or something similar.
Hagen bird bath
If you want to make some changes I think these would be fine to do now while she’s still settling in & wouldn’t stress her.