QUERY for Amelia and the Many Worlds

Again, thank you so much to everyone helping.

I've added in more information. With the parallel worlds and alternate versions of "Amelia" and "Seb" it is so tough to write this.
I thought more information would make it worse, but maybe some additional information does help.

What do you think?

An alternate version of herself gives twelve-year old Amelia a pendant allowing her to travel between parallel worlds. At first, she is only interested in visiting her dog, who is still alive in the serious academic-minded reality of the “Amelia” who gives her the pendant. She is gradually introduced to four other realms; one where people live in underground cities so the earth’s surface remains unspoiled, an old-fashioned world built up around geysers and steaming mud pits, another that is book-obsessed and almost entirely covered in water, and a world where robots do all the work while humans play and her middle school’s motto is “all fun all the time.”

Soon she is caught up investigating catastrophic events such as a super solar flare and massive earthquakes killing people in other worlds. One version of her family dies as she tries to save them and if she can’t figure out the cause of the disasters, the next realm that is destroyed may be her own. But how is she supposed to do that when every time she travels to a parallel world, an alternate “Amelia” takes her place in her home reality, causing problems, getting her grounded, and telling her mom she’ll try out for the middle school cheer team?

Complicating everything is her friendship with Seb, a boy she keeps meeting in the parallel realities. She has a little bit of a crush on one version of him, but learns an alternate Seb is the one causing the deaths of millions. He killed everyone in the alternate realm of the last person who tried to stop him and now Amelia must put her own family and friends at risk if she attempts to save the world(s).