Going on that, as you said
Frontier, Yea it looked like Captain Marvel was upset with Medusa, but really when you think about it their really is not much Captain Marvel can do about it. Even if she was a Government High Level Official Arm-n-Arm with the President of the United States and the United Nations somehow, go figure how that would work, the World still has National Sovereignty Laws that protect Leaders of other nations. How do you think it keep Namor safe after the events of AvX or Victor Von Doom for all these years. Their are International Sovereignty Rules and Laws, you can be upset with Medusa, but they can't really do anything, otherwise they are WAY Overstepping their Power in ways they CANNOT DO!
So Captain Marvel and the Ultimates have NO Real Power to Arrest Medusa!
Also, in Issue of Uncanny Inhumans #11, Tony Stark short of expected the small, not so much of a deal retaliations form them. He DID Break International Law and invaded a Recognized Nation. Honestly I like Tony Stark, but he is Luck as Anyone to NOT be in Jail for his actions in Civil War II Issue #2, Really Lucky!
So ANY really threat to Medusa is really from Within like we are seeing with Triton, Lash and Maximus, a Civil War in the nation of the Inhumans. We need to see how that plays out, if it does, but any outside force trying to rule over Medusa and the Inhumans would be a Terrible In-Story choose for Soule to do, but I don't expect that of him, he has proven to be a MUCH Smarter writer then that. ;-)