Sounds like the timer knob is broken for a start, don’t think this relic will have the common inner cam that often breaks on the Washcraft series etc. 🙁
The number she has given you is off the rating plate, don’t know why Zanussi used the C numbers as they were practically meaningless. All you need is the one off the fascia panel, either on the soap drawer if before 1987 or on beside the timer knob if later.