Never met a girl who actually asked me that. Are you friends with exes?
You could take reflexes line and play it back against them, say you have an ex coming over for dinner one night but that's just as likely to piss them off as well.

The issue is that in your head it's not really fine for her to go off and meet exes, that's your line (it's my line too) but you don't want to say yes go for it and then dump her because you like her.
If there's one thing you should have learned from PUA or this site, it is to flip things round so you have to ask yourself the same questions, imagine how you would respond if she was asking you the same questions.

It's a very close line in my book and is closely intertwined with whether you develop emotions or just want to fuck them.