I didn't think they made a 10" silent spinner! Actually girls often tend to be much larger. A 10" diameter wheel may be fine though. Main thing is it has a solid surface and isn't a mesh wheel.
Ah yes they do! Must be a new size - however - I wouldn't buy one without testing it first. Silent Spinners have had an issue in recent years - whereby they just don't spin very well! They are stiff and hamsters can't push them sometimes - it's since a manufacturing change. If you've ordered it online then check it out when it arrives and if it seems stiff and not free-spinning I would send it back for a refund.
It isn't silent either - they can be quite rattly!
Had a look on Amazon.ca. They do sell the 8.5" (21.6cm) comfort wheel which might be big enough, depending on how big your hamster grows. That definitely isn't silent but it's an ok wheel.
https://www.amazon.ca/Kaytee-Hamster...gateway&sr=8-6