[@shylarah]
Tetanus is not just rust it's also on plants 
But in this case it would not work since the realm is not a human one

Tetanus is a very fascinating disease...one of the best section in microbiology
Lockjaw...can have the subject with muscle spasms so bad they snap their own spine

Anyway. For her to get a disease she would need to some into contact with someone from the human realm who is either a carrier or is sick

Or she somehow manages to wander into the human realm to contract an illness and have it incubate until she gets back then have it become fully into the illness stage
This would probably be bad for the fae realm either way