In oras, Aqua and magma would not have been able to release the power of the super ancient pokemon without her. This is canon fact, they knew because she supplied the information.
You're god damn right they would have done it anyway. Any sane person would. There was a six mile wide rock hurtling toward the planet. The loss of life would have been obscene, and it would have lasting effects that would harm even more people.
Hoopa's shenanigans and dual releases do not a multiverse make. The most Zinnia herself offers are possibilities. Nothing concrete and never any evidence.
tl;dr you're waifu a shit