Lola is now 3 months!!

Its been sucha Happy Journey, & Her and Sassy are finally starting to get along.
Although, I just noticed Today [several times]
Lola was "Doggy Dancing" on this stuffed animal i got her.
Shes only 3 months so I dont think shes going in Heat.
Is this normal?!
I'm worried--I thought 3 months was too young?