I haven't seen Mean Girls but I personally would recommend skipping Oklahoma unless you're familiar with the original rendition of the show and are actually genuinely interested in seeing a unique take. I found the show painfully hokey and boring. The performances were strong but the plot and storytelling itself was just awful for me.
Hadestown on the other hand is absolute gem of a show. Have fun!
Caption: Every so often there was a rare moment of perfect balance when I soared above him.