Here's the thing.. Let her try to get it to eat fish. It's a BP. It simply won't eat fish. Ever. It would stavre itself to death before eating anything which is not a warm blooded mammel.

Did you try to at least tell her that if she keeps it in a large enclosure without the right temperatures on hot and cool side and high humidity, that it will just starve anyway? That it will not eat due to stress. It will die from not being able to digest if it does eat, or it will just get sick and die anyway?

It's not a science to keep a BP healthy. The sad truth is, your friend will learn the hard way. When that happens I will not feel bad for her ignorance, I will feel bad for the poor BP.