I would see how she goes and set the cage up with lots of ground level toys like tunnels and hidey places. She may gain in confidence as she grows. I'm not sure about not limiting access to a wheel - I think most hamsters like using a wheel. One that spins easily might be good though. The new Silent Runner in the 9" size might be good for her if she is small. It's a very stable wheel with a metal stand and nowhere to get trapped. It spins really well and easily and is also silent
The main thing is when taking it apart and putting it back together you make sure the front and back are pressed firmly onto the running track, so there is no gap at the joining strip. It's a fiddle the first time then after that it's quick and easy and a piece of cake
I have the 12" one for our large Syrian and it's the best wheel I've ever had! They also have no spindle and large entrance holes so they're easy to just give a wipe round inside without dismantling every time.
Silent Runner 9"
Some people are using the 9" one for dwarf hammies because it's light and spins easily.
I'll wait and see what others say about wheel usage for a runt, but I would think they would need one sometimes.
You'd need to think about toy safety maybe if she's a bit wobbly or not very strong. One of our Syrian's favourite toys is this hyacinth tunnel in the small size. It's nice and soft with no scratchy bits, it's also safe to chew (and he likes having a chew of it) and likes the little side holes to go in and out of.
https://www.viovet.co.uk/Boredom_Bre...tunnel&sct_r=1
These are also good - they can chew the dried carrot off the top or chew the cardboard with the hay stuck on. Or just use it as a hidey place. There is no nasty stuff used - the hay is stuck on with vegetable starch and I haven't noticed any sharp bits with them although I pull the odd stray bit off that goes across the doorway. Small size again
https://www.viovet.co.uk/Naturals_Ca...nimals/c17273/
Our Syrian also likes this round coconut hut - it's good quality inside I've found, not rough and scratchy and the entrance hole is big enough for a Syrian. Again I pulled the odd stray hairy bit off the outside
HAPPYPET SMALL ANIMAL HAMSTER GERBIL COCONUT HUT NATURAL CAGE HIDE HOUSE 31021 | eBay
Maybe stick to softer type things - even bendy bridges can have spiky bits on and gaps between the logs. The rainbow bridge is safe and popular
https://www.viovet.co.uk/Boredom_Bre...bridge&sct_r=1
And lots and lots of deep substrate and cardboard toilet rolls I guess - and a nice dark house to sleep in. Erin's hamsters 10 toilet roll toys video has lots of ideas for toilet rolls!