is the sweet potato raw, cooked, baby food??
Ok usually runny poo or diarrhea is most commonly food related, considering she was just at the vet and is said to be healthy lets go with diet.
I get, it may take you some time to gather up the ingredients for what ever diet you decided to go with but that baby needs more than she is currently getting. There are some other things she can eat.
NO Seasonings oils or butters when prepping food for gliders.
proteins she can have......... boiled or baked chicken, boiled or baked turkey, boiled or scrambled eggs ( no milk just eggs ), yogurt ( no artificial sweeteners )
fruits.... watermelon, cantaloupe, honey dew, grapes, cherries, blueberries
veg........ green beans, peas, corn ( not every night ), carrots
take one item from each group per night. so for example tonight feed, scrambled egg, green beans ( not canned ) and watermelon. Then rotate the next night, with a different protein, different veg n diff fruit UNTIL you get her on a staple diet. This is NOT a long term feeding plan, but it can be temporarily until you get her on a well known diet.
Yogurt and eggs are pretty inexpensive, so is a bag of frozen veg ( then pick out green beans, or corn or peas what ever through the week then one or two nights give the whole mix instead of separating specific ones out ) I use fruit cups already pre cut which is like 3 bucks in the deli section of the grocery store. This all pretty inexpensive to gather up.
For now, until you get her on an established well known diet, stop sprinkling calcium on her food, that may be contributing to her runny poo. It's not going to do any major damage to go a week or two without calcium until you get her on a diet with calcium distributed evenly in it in a measured amount.
If your feeding sweet potato raw, stop. Raw Sweet potato has an enzyme in it that prevents the body from utilizing protein properly. The enzyme is neutralized after cooking to make it safe to eat.