This would be an argument for why the writer said "her" in reference to Ororo. We didn't know until the end of the book that Cassie had sent Ororo after Jean's team, and the writer wanted to keep it a mystery till the end of the issue. If it were Jean that Nova feared, wouldn't have Kyle have just said "Jean" since we already knew since issue 1 that Nova and Jean's team are working against each other? There would have been no need for secrecy from the readers if Kyle meant Jean. I think what it was is Nova wanted to get control of Ororo, but was actually afraid of Storm given Ororo's power levels and mental defenses. There was a time when Nova swapped minds with Xavier backin New X-Men. That means she would have had access to all of the information Xavier had stored on all the X-Men including Ororo. Storm's mental defenses would certainly be noted in Xavier's files on her if the writer isn't PIS'ing Storm.