Ya you need to bring that frog to the Vet. Especially if it is a fungal infection or parasite, that won't leave on its own. Just be sure when you transport it, put it in a container with some damp paper towel (or some moss from there vivarium) and place it in a cooler (keeps the temp constant) this will prevent the elements from putting them into a worse state. I would also highly recommend separating the male and female from one another. You don't want to sick frogs, hope all goes well for her.