If you have an Aldi nearby their organic whole milk yogurt is good, most European brands will be good too, but they're pricey. I can't remember if chobani is good...
You can give her plain yogurt with active cultures. That will be a good dose of probiotics. Do you have watermelon you can give her? That's a good prebiotic, food for the probiotics.
@azygous @Wyorp Rock @Eggcessive can you help?
From the articles I've read you should initially withhold food for 36 hours and then treat the condition.
Is she healthy enough to do that? How does her weight feel?