She does look young and purebred. I don't have experience with females that have gone through a heat so the swelling of the nipples could be from that or it could have been a pregnancy, I'm not sure. Did the vet mention anything when she was spayed?
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 6 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010