I don't mean to defend the company at all, but it would appear that the person to whom that letter was sent to had finished the whole CPL/IR training, type rating as well, but never started line training by her own decision cause she got married, her husband didn’t want her to fly, she asked for an office job but was declined, and she never flew a single line sector in her life.
All of this after being sponsored by the company.
Not entirely surprised they are asking for the training money back. Actually surprised they didn't do it sooner than 6,5 years.