Don't know Hun, I wish she could tell you! I'm guessing it might be just that though... she can't tell you. At this age her understanding of language, the world and her potential to have influence on your behaviour / things / food choices etc. is really expanding, however she doesn't have the expressive language or motor skills to make these things happen. It must be SOOO frustrating for the little people. Guess it also could be teething, reaction to particular foods, something else sore (such as an ear infection??, though this sounds less likely from what you described). Sounds like distraction when you're out is what's working best for her so I guess (though I know it's easier said than done) it might help to just keep her as occupied as possible with new and engaging experiences. Maybe try a bit of baby sign language with her so she can communicate her needs??

I hope very much that it's a short-lived phase. Big hugs.