No, the trans nonsense remains an unverified rumor according to the local police.
Her parents posted an obituary for her under the name of Megan Betts.
https://www.legacy.com/obituaries/dayton/obituary.aspx?n=megan-betts&pid=193635354
Haven’t found one for “Jordan Cofer” yet.
A gay magazine identified this on the morning of the shooting along with some of her classmates.