Hi Romping Ratties,
You can tell Tooter is a boy by those long, long nails. In a RES's mating ritual the males use their long forenails to caress the female's face. They will spend over an hour trying to get in the perfect position in front of the female so they can shake their nails at the female. Also, I'm willing to bet that Tooter has a pretty fat tail -- male RES's tails are longer and fatter than females. Males are also smaller full grown than females -- they only attain a full length of about 9 inches compared to a female's 11 or so.
http://russiantortoise.org is a great site for Russian Tortoises. It is very well respected ... pay special attention to the dietary concerns though. Your mom's Russian looks to be extremely healthy ... she should be proud.
Turtles are great, aren't they???