I think it's possible that Pregnant Lady mentioned it in passing, or asked it as a favor (perhaps because she is a regular reader--from the description--and feels she has a semi-personal relationship with the blogger), so that she can continue to visit the blog often.
if the photo is lingering several days, the Pregnant Lady may have felt it would be fair to request it.
And I do think, actually, it would be fair for a *regular* reader of a blog to say, "hey, would you be willing? because I discovered that it doesn't matter what time of day, even in the evening when my nausea is lower, it still bothers me, and I really miss reading your blog."
The blogger didn't sound upset to me. Did she come across as upset to the rest of you?