Ok...
Towa said that if Mira keeped increasing his ki, he would explode and the Universe would be gone.
However, then later she hypothecases that there is no telling how large the explosion would be, and thus she starts thinking it could break through dimensions and destroy the egg.
Then later on she ask our patroller for help and stop Mira, becouse if not "we'll all go up to smoke".
She says there is no telling how long the explosion might be, but she instead of running away from the Battlefield, is asking our patroller to fight Mira.
Which implies that Towa running away might not've saved her.
If she was too sure we all would "go up to smoke" after Mira's explosion, and was so desesperate that she asked our patroller for help, means that later after making her hipothesis the explosions would indeed reach her, even her being in a parallel dimension.
To sum up, and to make it clear.....mind you that obviously...., there is a context as of why the Game devealopers/the authors wanted to make that dialogue and made it seen this way.