Why does she feel she has two channels within herself, one connected to the divine, and one that seems galactic and can take her over?

What she is sensing is exactly what you told her you felt intuitively, that one of these channels is connected to the divine and authentic in receiving divine messages and feedback, while the other is a manipulation that can misguide and misdirect her and give greater access with a more discernible impact to empower the possessing spirits to manipulate her more dramatically. With practice, she can learn to embrace one and make it more effective, while constraining the other and weakening its influence so she remains in strict control with respect to allowing in outside energies. That is a normal barrier function that happens automatically, but can be overridden and, in a sense, fooled by interlopers who know how to manipulate their host and begin a dialogue through the person's mind dropping its guard, and allowing them to have influence directly on thoughts and bodily sensations via the nervous system and muscles, particularly.