I think the episode Between Dawn and Dusk did Twilight dirty. I think she can actually lift at least the moon by herself. They never even made her try. I think if she tried she would be able to lift it, of course with lots of difficulties.
Sorry for the inaccuracy in the background. I am not very good at architecture as you can guess. It is very hard for me to understand. I can draw natural stuff but not unnatural buildings so I did my best. Also the sizing is off.