I posted a much-wishlisted cookbook that I received from another member.  According to the Help Center, I am to make the requestor aware of any stains on the cookbook.

Sounds as if you are correct to me.   I wouldn't send it without the ok from the requestor. 

How long has it been since you PM'd her? How long before the request times out? Unless you are at the last day to accept, give her some time to respond. Not everyone checks their PMs every day.

However, you might want to send a second PM telling her you will NOT be sending the book unless you hear from her that she still wants it. Some people just assume that not answering means it is OK, please send. But since cookbooks and textbooks require agreement to any damage before sending, it's important to get that OK.

If you don't hear back from her, no, don't send the book. Unfortunately that means the request will cancel and you will have to repost the book, and the request may just go back to the same person again, but maybe if it does cancel she'll respond to your PM the second time.

It took her almost all of the 48 hours to respond to the offer of the book so, as was suggested, she must not log-in daily.

I've pm'd her twice already, but will give her until my mailing deadline which, I think, is two more days.  Then I'll just cancel and send her another pm. 

Hopefully, though, she will log-in again before that mailing deadline.

Thanks for the help.  I appreciate it.

Jan