The First White Mother was currently Abraxus' third disciple. But, according to Evangeline, The Entity, Abraxus' second disciple, hadn't been there to witness its senior brother's first few wives on the immortal plane.
What did this mean? It meant that between the entity transcending and the first disciple becoming Abraxus' disciple, there were several tens of billions of years. This meant that in all likelihood, even more time should have passed between then and the First White Mother transcending and becoming a disciple.
The timelines simply didn't sync together. For the Holy Goddess to fall in love with Abraxus' First Disciple, she had to meet him, no? But, by this logic, the first disciple should have long since transcended by the time the First White Mother became a Holy Empress.