Answer:
This is A. copyright infringement.
Explanation:
In a case like this, it would be useful to know how much of Faye's work is actually taken from Game of Thrones --a real infrigement largely depends on the amount of content. However let's assume Faye took all the main plot points.
Taking the "heart" of a work and changing a few details, such as the name of the characters, is considred copyright infringement. This is also very common in music: song covers, even if they change the production or instrumentation to a certain degree, are still considered as infringing the law. To be considered Fair Use, the work must be transformative to a certain degree. This means, if Faye intented to make a parody of Game of Thrones, or if she simply took it as an influence and made a few references, it would be Fair Use and protected under copyright law. But that doesn't seem to be the case.