Not sure Eleven’s little roadtrip did much to add to the story…
Nothing. The fact that she was bleeding out of her other nostril, and levitating, and having flashbacks to incidents that made her angry were sufficient to illustrate that if she focuses on her anger she can be stronger. I guess the mother bit paid off at the end but meh.
Maybe they are thinking about sequels spin-offs and expanded universe stuff with the 008 girl and other test subjects but it was pretty pointless.
Basically the character with God like powers had to be elsewhere or the show would have been over in 4 episodes.