Entering the Dao God Realm didn't necessarily mean you had a Founding Dao. In fact, the majority had Ancient Daos. The Dao Gods with Founding Daos were on a level all to their own, and the perfect woman had truly not expected that this disciple of hers would have such a husband.
Although she hadn't said anything, that didn't mean that she hadn't originally been a slightly bit unsatisfied. It was only after deciding that the pros of taking Mae on were better than the cons did she choose to take her on as a disciple anyway.
Women were disadvantaged in the cultivation world. Often, giving away their Primordial Yin weakened them, especially if they were cultivating certain techniques. For Dream Asuras that were heavily reliant on the soul, giving away a Primordial Yin was akin to giving away a piece of their talent, and that was often difficult to overcome.