Julia went to see Maggie Evans about the possession. Maggie was able to rid Julia of Angelique but Angelique somehow took Maggie over. Maggie/Angelique was in the process of disconnecting Phyllis Wick from live support. ... Maggie seems to have shaken off the possession. Whether that was true would probably have been addressed in season two. I think it's safe to assume that no one gets rid of Angelique that easily.
What I always find fascinating when it comes to that aspect of the finale is that, as edited and broadcast, it played differently than it was shot. Prior to the show's run, a long gone (but really great) entertainment program named
Preview included behind the scenes footage as part of one of their segments on the show. In it the possessed Maggie suddenly screams "NO!" at a point after Victoria reappears and then Maggie collapses in Roger's arms:
Was that possibly due to Angelique's rage simply overwhelming Maggie - or is it possible that Maggie was intended to collapse because Angelique ended her possession? We'll never know. Especially when the whole incident was cut from the show, so perhaps they'd decided to take things in a whole different direction if there had been a second season...
Also note that Carolyn/Barbara Blackburn did indeed shoot material for the finale even though none of it was included in either the NBC or MPI versions.