{{{{{{{{Mel & Daughter}}}}}}}}}
Did she tell her teacher what happened?? The teacher needs to know the actions of her students, for pete's sake!! Where was she/he at the time?

Talk to her teacher and demand a public apology from those kids to your daughter! Be there, if you can. This will show them but especially HER that she is not alone in this; that Mom fights back WITH her.
Tell your daughter that those kids are terribly immature and ignorant. She needs to feel proud of herself for being a "normal Woman," NOT ashamed of a normal bodily function. Remind her that those kids were the ones "showing their *****" and does NOT reflect on her!
Maybe if you share the saying about being nervous in front of a group of people... tell her to picture them naked and laugh back at them... or... tell them they pull their drawers down to use the toilet just like she does. This is up to your discretion, though. I'm feeling pretty mean and defensive for her right now.
Tell her Grandma Tomi knows how it feels. It happened to me, too. She doesn't need to feel ashamed! Give her my
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.