She doesn't know what she's talking about. Your guest is YOUR GUEST. You can certainly bring someone from here. Don't even bother confirming that with her. Just do it!
I think I will do just that. I'm not even going to try to rock the boat by trying to use someone from out there like HDC, even though I like their packages. I don't mind TP or their style, but they don't offer as much coverage as I want. MAYBE I'll use them for the video, I'd want a video of my ceremony at the very least.