You should probably be able to see a scar on her lower belly (lengthwise).
Importance of getting her spayed (if you don't plan on breeding)
Females tend to be better pets if they do not experience oestrus every six-to-nine months. Heat cycles bring hormonal changes that can lead to personality changes. Repeated heat cycles subject the reproductive system to uterine and mammary cancers and uterine infections. Some bitches experience false pregnancies that can be a bother to deal with and uterine infections that can be fatal. The heat is messy. You have to be very careful to prevent unwanted pregnancies.
Dogs and bitches do not get fat simply as a result of sterilization surgery. Like other mammals, they gain weight if they eat too much and exercise too little or are genetically programmed to be hefty. Weight gain that seems to follow spay or neuter surgery is most likely a result of continuing to feed a high energy diet to a dog that is reducing his need for energy as he reaches his adult size. Excess energy in the food becomes excess fat on the body.
Link to removing baby teeth, if not lost
http://lowchensaustralia.com/health/teeth.htm