[altigger74]

It sounds like the little one is going to be going into heat and the spayed one is trying to enforce her dominance. I am having the same problem with my two girls. Lately Gracie who is 1 1/2 snaps at Bella (who turned 1 today) when they go outside or comes in. Other than that they are fine together. She doesn't hurt Bella at all and Bella just stands there and takes it (not submissive but not attacking her either). But it has gotten to the point that Bella will not go outside unless I go out there too. I spoke to my vet about it and he told me it was a dominance issue and that I need to reenforce that I will not put up with that and that I'm the big sh*t in the family not her.