Again, semantics. Is it still incomplete if she never gets the cert.? Does whether or not she becomes an expert drysuit diver or not have a bearing?
The difference between being an "expert drysuit diver" and being able to show a drysuit specialty card only matters if you want to rent a drysuit some place you are not known. I dove dry many years without the specialty in my personally owned drysuit. I eventually got the certification before teaching it so I could be sure I was providing the best training.
Certifications are generally just a ticket to use someone else's equipment, be it a tank, a boat, or a drysuit.