Nothing. It's the typical German tendency to re-invent the wheel. The so-called L/R authorisation was only a license to print Deutschmark bills for some flying schools who back then successfully persuaded the LBA to require such a qualification.
It's no longer required since the introduction of JAA licenses. Everybody knows that.
If she does not react - then, well, f... her. She works in the dept. which does the hiring of pilots for this particular company and apparently she does not know a thing about the requirements - nor has she ever been properly trained accordingly.