It took some time for Iris to gather herself after experiencing such an existential crisis, but she eventually got her act together.
Experience was key here.
If it weren't for the countless turmoils she'd been through as she grew to her current level, she probably would have faced much more difficulty accepting the current circumstances.
No, it was still difficult.
To recognize something so deeply ingrained in her as a problem, how could it be something she could do easily?
It wasn't as simple as the Ancient Sovereign made it sound. This problem was deeply related to her reason for refusing ascension, the decision she was most sure of yet most regretful of at the same time.
However, she was eventually able to understand her faults and make a flimsy plan for the future, which would become more defined as she learned if the path she was following was the right one.