These facts, combined with the general sealing of Oblivion at the hands of Martin, mean that while her influence in certain parts of Tamriel can still be great, in Skyrim it is weak and few still hear her, even at a time when political intrigue and betrayal is at it's greatest. In Skyrim, however, where the worship of the Divines prevail, Mephala is not invoked as often, and a great manifestation of her power, the ebony blade, is locked beyond a door sealed with magic that prevents even the Prince herself from seeing through it. Her influence hasn't been greater in millennia.
This implies her power and influence is waning, but my understanding is that after the fall of the tribunal the worship of the three "good" daedra is on the rise.