Conjectured causes included injury, a plague that was sweeping through the city, and a natural cause. This theory was based on the discovery of several ushabti fragments inscribed for Nefertiti (now located in the Louvre and the Brooklyn Museum). A previous theory that she fell into disgrace was discredited when deliberate erasures of monuments belonging to a queen of Akhenaten were shown to refer to Kiya instead. During Akhenaten’s reign (and perhaps after), Nefertiti enjoyed unprecedented power. By the twelfth year of his reign, there is evidence she may have been elevated to the status of co-regent: equal in status to the pharaoh, as may be depicted on the Coregency Stela. It is possible that Nefertiti is the ruler named Neferneferuaten. Some theorists believe that Nefertiti was still alive and held influence on the younger royals. If this is the case, that influence and presumably Nefertiti’s own life would have ended by year 3 of Tutankhaten's reign (1331 BC). In that year, Tutankhaten changed his name to Tutankhamun. This is evidence of his return to the official worship of Amun, and abandonment of Amarna to return the capital to Thebes. In 2012, the discovery of an inscription dated to Year 16, month 3 of Akhet, day 15 of the reign of Akhenaten was announced. It was discovered within Quarry 320 in the largest wadi of the limestone quarry at Dayr Abū Ḥinnis. The five line inscription, written in red ochre, mentions of the presence of the “Great Royal Wife, His Beloved, Mistress of the Two Lands, Neferneferuaten Nefertiti”. The final line of the inscription refers to ongoing building work being carried out under the authority of the king's scribe Penthu on the Small Aten Temple in Amarna. Van der Perre stresses that:  This means that Nefertiti was alive in the second to last year of Akhenaten's reign, and demonstrates that Akhenaten still ruled alone, with his wife by his side. Therefore, the rule of the female Amarna pharaoh known as Neferneferuaten must be placed between the death of Akhenaten and the accession of Tutankhamun. This female pharaoh used the epithet 'Effective for her husband' in one of her cartouches, which means she was either Nefertiti or her daughter Meritaten (who was married to king Smenkhkare).