Toga Himiko, as much as any of the characters in the My Hero Academia universe, has her own life and story. At least until now -- she's still out on the town. Her dying would be a matter of tremendous grief and Internet silence. I think Our poor little flower is tough enough for some rock. I don't even like to imagine the scene of her departure.
In addition, her unique personality and her obviously weird quirk brighten the storyline up considerably. Himiko Toga, who goes from an innocent observer of the world to a threat to it one time after another -- such character development is dramatic indeed. The examination of her past history, and her peculiar views of love and affection, make her one of the most interesting parts in this cast of characters.
I'm no prophet and can't see much into the future. But I firmly hope that she will around for a time yet to come in this world. The life of a villain in anime never goes smooth. So we will have to cross our fingers and wait it out, just keeping up with the updates on manga and anime. Then: Don't worry, Me Too! At present, life is still very good for Toga.