A couple of questions... Was she bottle raised ? If so - was she raised in a pen with other calves both before you got her & now? The reason I am asking is that the ears do not look like ringworm/rain rot or other fungal nor do they look as if a bacterial infection is going on. Looks to me like perhaps another calf is "nursing" her ears thus causing the skin slough. Years ago we had one with the same issue - usually it is on their umbilical humps or genetilia but I have seen one other case where the ears were nursed & looked exactly like your pics!
If not penned with other calves now - the damage should clear up over time. If penned with others - seperate her. This may not be your issue - but parasites, fungal or bacterial inflamations & infections generally do not look like what i see in the pics. I agree that if she is penned alone & the issue isn't clearing up - you probalbly need to call your vet. In the meantime just keep the ears clean - I'd use an iodine based solution - just in case it is a funky fungal issue! Iodine based solns will clear up fungal issues & some bacterial issues. Good Luck.