Following Muller's graduation, she worked as translator in an industrial enterprise, but was fired in 1979 after refusing to become an informant for the secret police, Securitate.
Nakon što je diplomirala, Muller je radila kao prevoditeljica u jednom industrijskom poduzeću, ali je otpuštena 1979. godine kada je odbila postati doušnik tajne policije Securitate.