Just ask them for their number.
You are not a lion and they are not a zebra. You do not need to isolate them.
Just ask them for their number.
You are not a lion and they are not a zebra. You do not need to isolate them.
Plus... if she says no, you have now made everyone else at the table your second choice, and no one wants to be second choice.
(The first one I'd try: a friendly group contact info exchange suggestion, to be able to keep in touch, would let me then follow up one-on-one later over text/calling/facebook/your method of choice, without having to corner anyone.)
My guess is that by "isolate" the parent means it would be awkward to have others at the table hear that you are doing that (edit: asking for a phone number) or it might make someone who wasn't picked feel uncomfortable or even the person you've picked might feel uncomfortable in front of others rejecting (or even accepting) a phone number request.
It's also a sign of cowardice. Cowardice is unattractive in potential mates.