The earth is saved, but at what cost? We can start that tally with whatever a superhero costume costs, which is an interesting thing to think about. I mean, the way they go through them even in mainstream comics (let alone ENF) they have to be pretty cheap, right? But at the same time, material that can stick to every bodily crevice like glue must come at a premium. It also has to be considered that Spidey can afford one, and he's canonically poor. On and on we go: the possibilities make ones head spin, frankly, and I can see why comic writers don't dwell upon it too much.
Regardless, Marvel Girl's costume is long gone, having fluttered down into the financial district minutes ago, and now she's left with a stark reality that she's hovering over the city in a delicate state and it's a long flight back to Westchester.
I know what you're thinking: was this 8 page story just a thinly veiled excuse to have Charles Xavier do an "Extras" reference? My response to that is: yes, yes it was. I think that in this case the journey made the destination worthwhile, but you can be the judge.