I agree completely. That image is so misleading. I can't imagine why they bother to show it on the DVD cover except to mislead us. I had no expectation that the movie was about to end when it did, especially after only an hour or so. I thought that she was about to recover from her electric shock and head into Los Angeles or elsewhere and start playing havoc on the freeways (as depicted in the image), which frankly would have been a lot of fun
, though admittedly she'd have to be a lot more than 50' tall to stand astride a multi-lane freeway.

That would be one massive dump
Poorly Lived and Poorly Died, Poorly Buried and No One Cried

I think that would have been her protest against people not going green with their gas guzzling cars littering the highway. So, she would litter the highway 50' woman style.

I had to go take a look at the poster. To me it looks like she's taking a dump on the highway.

Best movie poster I've ever seen. I saw this movie when I was a kid
on the big screen. She was stunning on the big screen.
"Many troubled things have been in my life, a few actually happened."
Mark Twain