I disagree with her whole premise.While I think Calliope is being a bit harsh (by her own admission), I don't think she's treating anyone like "a piece of dirt" here. She was reiterating the seriousness of the issue by putting it in a graduation context (i.e. "time is running out for you to fix this), not saying that the OP is unfit to be a vet.
Simmer down, y'all.
There is nothing for the individual to fix.
There is a systemic problem here that largely goes away after graduation (except for the poor saps going on to internships/residency they just delay the solution).