is“yodel”"yoghourt"?
I share my lunch-less plight with them, but between the four of us, we can only come up with a dollar twenty. So my lunch consists of half a soggy tuna sandwich from Stephanie, a yodel from Emma, and three carrots from Tracy. It wouldn’t be so bad if the conversation wasn’t all about the party tonight. But not MY party. Leo’s party!

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It's obviously a food, but it's not yoghurt.  It's a chocolatey roll, covered in chocolate.

http://en.wikipedia.org/wiki/Yodels

Answer

A yodel  refers to a  type  of Swiss singing. It seems that Emma did not contribute anything to the lunch. It could be a misprint if the author meant yoghurt.