perigra's idea is good-mutual respect :) Boo is absolutely right re. gravit*t's level of well, awareness, and daffi has just made me snort water through my nose with that comment!
I hope you get it sorted Alf, it would be a shame for them to start off on the wrong foot. I am sure even more advice will be posted; there are some very knowledgeable people here on AB...and then there's gravitate.
Does your dog feel safer off the lead Alf? I only ask because mine does-he is a flight not fight kind of dog, and new introductions work best when he can walk away if necessary. Is there somewhere safe and enclosed you could let her off to meet the pup? Or do you think she would just go all-out?
I understand how much you want them to get on; paws crossed for you all.