I don't see why Solars shouldn't support other Solars the way Lunars and Sidereals and Dragonblooded do. It's unusual, yes, but it's not bad. You can't always take over the country yourself.

It seems to me that you are supposed to
  • Interact with them as fellows or rivals or something. Her Circle is not as powerful as that of the Bull of the North, but there's obvious similarities.
  • Use them as an example of what Solars do.
  • See that Solars can easily be monstrous people.