Everything changed when she became a vampire but Julie said (which is probably a lie coming from her) that she wanted to bring the story around to make Stefan and Elena canon. So probably.
Without realizing it, they were always together in every era. They were destined to be together ♾️. Amara and Silas Tatia and Ambrose Katherine and Stefan Elena and Tom
I just realized that bonnie is the last of the Bennett line and that if she ever stayed dead the Bennett line would have ended with her GOOD THING SHES A BADDIE AND CLOCKS THEM FLOPS