Hi Richard
I've got to just check in if you're SURE that it's only the physical side of things she's interested in. Any chance that there's still some emotional involvement going on with her after you two being so open with each other, even if she isn't spelling it out loud and clear?
It may not be that she wants things back exactly as they were right now after everything, it would only be natural for things to be on a different level now, but perhaps there's a chance that she's looking at where things might or might not go again?
Maybe run with that openness you both had and have a real talk with her about where this may lead/where she thinks it MAY lead.
But if it does come down to purely sex I've got to agree with the above, there's a good chance that one or both of you are going to get hurt given what you've said.
Alison