At this stage I would definitely call it leash-frustration, with the frustration stemming from her inability to greet the other dog or chase the cat. That's how my dog started out. But that almost always turns into leash reactivity unless it's taken care of early on, like it did with my dog. So I'm glad you've decided to address the issue before it turns into something more.

I also would suggest not letting her meet dogs on-leash for a bit. It might drive her frustration if she expects to be allowed to greet other dogs when she's on the leash. I don't really like on-leash meetings anyway, because the leash interferes with proper greeting behavior. I much prefer small playgroups. It's more of a personal choice, though.