Women have a very normal discharge as a way for our cunts to clean themselves, it could be that and she just has a lot of it, or a yeast infection medicine.

Everyone thinks a yeast infection is because a girl is dirty, it's because a girl has been washing herself TOO much/douching in most cases.

It's a gstring, so it's basically getting pulled up her lower half. If she was wet or had a discharge and it dried it could be there seeing as it IS a gstring and those are tiny.