No she wasn't. For people who work in rescue and shelters it's very hard to see anything past what you see every day at work, the misery and helplessness that you have to endure. But it can also mean that you get weighed down by what you experience and come down on others unnecessarily hard for things that aren't really deserving of it.
She saw a cute puppy, and wanted to share. She's not going to buy it, and doesn't believe in pet stores, in fact has one dog from a shelter. That's it, nothing more - lighten up, I know it's hard when you see what you see every day, though.