Dorothy was not pretending to be strong; in fact, she wasn't very angry at Eve's apology.
Even though this Mother Superior had just admitted to abandoning her, it wasn't without reason, and the promise to be a good mother in the next life might sound ridiculous to others. But for her, who indeed came from the future, it seemed sincere.
Mother Dragon was indeed trying hard to be a good mother now.
As for the mission Eve mentioned, although this Nun Mother did not specify, Dorothy could guess the content of that mission.
What else could it be? As a Primordial God, her mission must be to resist the Angels and save the world.
In the choice between raising her daughter and saving the world, this Goddess of the Moon chose to save the world.
This is a classic old problem; most heroes who have families before taking on a mission would face this unsolvable choice.
To choose family, or to choose the mission.