Compare the date of Ariel's death (
https://www.depts.ttu.edu/dos/memorial.php ) to these messages here. No, Ariel and Avery are unrelated, the Avery on that list is also not the Avery we know about. Robyn Judd's death is closer in date to these messages, but she is faculty IIRC:
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EDIT: My theory is that if Ariel is not trans, and assuming Isabella is somehow connected to the suicide, it may be related to drugs (Isabella says she might have ODed.) If she is NOT connected to the suicide, then "the messages burn" for a different reason...which is still suspicious. Why would they be worried about the Uni investigating why (or how) the suicide happened? A lot of questions.