Was I way off base telling her that it is a common trait of hers, to be some other place mentally during sex and during some make out moments? I said it as consideratly as I could with out glossing over the truth.
Lou, is kissing not an option? Lip locks can slow down talking.
I would suggest if you're facing her and she starts yakking that you gently put your fingers on her mouth and say "ssh, honey" or "ssh, later" with a kind tone.
Or if you aren't facing her or want a different approach, how 'bout a chuckle and something like "earth to BB, come in BB"? Of course, if she's never watched sci-fi movies that may fly right over her head. Just some thoughts.