Awww Lauren,
I'm so sorry to hear that Mango has an upset tummy. Chloe has had the same thing before. They'll probably want a stool sample at the vet, and you might get an antibiotic and an antiparasitic.
From what you describe, it sounds like the typical reaction when they get a little bug, and doesn't sound serious, so try not to worry too much.
My vet has suggested we give Chloe pepto when that happens, so we give her 0.8ml pepto. But if this is the first time you've seen this, best to take her to the vet and let them run the tests.
Keep us posted.