no one knew what happened
one day the dragon princess was studying on the royal canterlot library
and the next she was declaring total war against the Equestrian empire

she went to the war with just a clawfull of teenage dragons that were clearly to dumb to even fight against a trained legion of the E.P.U. guard

and she surrendered as quick as the first guard put a leg on dragon lands

many female dragons some teenagers and lots of magically downsized adults looked happy to be taken to the guard’s campsite as war trophies. there are reports of the ex-dragon lord smiling when she was taken to canterlot to atone for her crimes