ARgurl,
Beside the Ruger 10/22 being very reliable, it is short and lightweight - these two things make it very useful for a woman to actually use and carry. Aftermarket parts and "add-ons" make it fun to own as you can customize it to your tase or needs. It gets a premium price, but retains resale value.
Although the Ruger MK-II handgun is just as reliable, in my experience teaching women to shoot, it is somewhat heavy for long sessions at the range. Carrying it would be cumbersome. The Browning Buckmark, being lighter and having controls that don't break fingernails, [No flame! It is a common complaint with the Ruger!] seems to lend itself well to use by women. The Walther P-22 is very sweet if you want to have a .22 to train with that has the controls and handling characteristics of a "combat handgun". The ones that I have seen are very accurate as well.
Mario
"Gurls Rewl!" or as a buddy of mine says, " Chicks are cool."