YOu can always say "I'm not sure how I feel about that." or "Let's talk some more after I've had a chance to make some decisions," etc.
If she claims to want to fully come back to the marriage, I'd suggest saying "I'm not so sure how I feel about that anymore," and not jump at the first hoop she holds up for you.
If she says she wants a divorce, say "YOu're probably right. This isn't working for me, either. That would probably be best for both of us. Let's talk some more after I've had a chance to make some decisions."
