Thanks for your thoughts. I'm still just not sure what to do. We took Casey with us to visit with the puppies and she wanted nothing to do with them but was fine with the mom dog, which is a huge standard poodle. Her reaction to the puppies was actually funny...she refused to make eye contact with them. But she never growled nor was she aggressive towards them.
I know it would be a huge adjustment for her, soooo, still thinking about it. We'll see...