True, and I might see her point. However, intent and actions matter and the SpeedForce not only killing Alexa, someone who was NOT hurting anyone in that particular moment, but also threatening Barry by attacking Iris as a way to use him for his powers in order to kill Alexa, makes her wrong. So I would correct myself and say maybe not a villain, but definitely an antagonist. Which, I guess is different from the other foes Barry has had to fight over the years. They both want the same goal, but the Speedforce is willing to kill to get it achieved, while Barry isn't.
I think the issue