Could a variety of nature deities, including Mother Earth Goddess Gaia, cure a plethora of paranormal phenomena? Whether demonic afflictions that cause humans to become vampires and werewolves or even non-demonic conditions that result in zombies. The answer is indeed Gods, and Goddesses could cure such things and have in the past. Even Nymphs and Fairies have pooled power to aid in restoring humanity to those lost in the supernatural shadows against their will! In turn, the demons of Hell corrupted the Underworld and interbred with Dark Gods and Goddesses. They also created demonic breeds of Nymphs, Fairies, Elves, Leprechauns, and other servants of Mother Nature. In the face of mutually assured destruction, an agreement was reached between Gods and Demons to cause no further incursions into each others territory until the major battles of Armageddon commenced.
In addition, various agreements with the Angels Of Heaven as seen in The Supernatural Secrecy Pact prevent major interventions into the affairs of humankind and the denizens of darkness that put them to the test. However, Practitioners Of Magic calling upon Nature Deities in their respective wars of good vs evil are allowed to heed calls for help. More or less it takes a powerful witch, warlock, wizard, sorcerer, priest, or other true believers to get the attention of deities. Despite the obstacles of paranormal pacts the disciples of Mother Nature have been known to aid supernaturally afflicted humans in need. Whether indirectly through a humans magical practice or directly by their holy hand.
Other higher dimensional beings, including Jinn, can also reverse the vampire, werewolf, and zombie scourge along with other various supernatural states. Most commonly through Genies wishes. Of course, Angels could easily reverse just about anything but they are tightly bound by the non-interference policy of the Archangel hierarchy under the guidance of the Omniverse Lord. At the end of the day, it seems the highest level Lords want to play out every scenario possible in the various Parallel Universes to grant humans a wealth of knowledge and experience to prepare them for eventual afterlife Godhood.