I think no matter how mature our little one's get they still make mistakes.
Has there been a sudden change in your house? Does Bell feel ok? Maybe have a bladder infection or something? Maybe she is like our Annabelle, whom hates going outside when it's cold or wet? Any change in her diet by chance??
These babies of ours keep us guessing, but it could be a numerous lists of things to check off I think.
don't you just wish they could talk to tell us why they do what they do??
Oh, it would be so much easier!