Ask for the "Compact" model ... that's what Ruger is calling the rifle you described.
If you can't find the "Compact", you can always cut the stock down on a regular sized 10/22 to fit a smaller framed person. You can also look for a smaller stock on eBay or the INGO classifieds.
Here's a link to a current auction on eBay that has an "adjustable" stock that looks like it would work for you.