Her Instagram note reads:
Thank you so much for that brilliant invite to your formal.Unfortunately I'm locked in an intense staring competition with Luke Skywalker, somewhere in the middle of the galaxy, so won't be able to make it! Let me know how it goes!
And just to show you what she's missing out on, here's the video invitation:
I guess he'll just have to carry on "making lots of friends and gaining lots of knowledge" without her.