She already had an idea of why Estelle was so confused about everything even though she claimed to be the Goddess' incarnation, and the familiarity she felt with this girl along with the impossible showcase of power she held was enough to convince her. The ball of energy was originally hers, and there should be no qualms in her wanting to get it back, but she was hesitant.
Hesitant that once the pill was taken away, then there would be no more traces of the Goddess' magic in their country. The energy that had been depleting gradually, wouldn't taking the pill out just make everything collapse? Doomed. They were doomed if that happens for real. They were already struggling to keep their dignity up after all of these chaotic stretches.
As the Queen of said country, she hesitated before telling the other party what she knew. However, after debating with herself for multiple times, she then proceeded to speak up.