It is puss...unless they bleed white, then I guess it's blood. Here's the problem with taking her to a vet:
My partner has had white's since she was little. One of her white's got a cut on it's leg and she took it to several specialists. All of them said there was nothing that could be done for a frog because they absorb everything through their skin, thus it can't be treated.

The thing about this stuff I got is that it's supposed to have the nutrients needed to help reptiles and amphibians get the "critical nutritional support [needed] during stressful periods for your pet." To me, this means that the nutritional support provided may help her heal. What do you think???