Advice req

Muscle750

My wife has only been working part time due to ill health for the last 12 months , prior to this she was off work for 12 months with a neurological illness which affected her nervous system. She works at a school as a teaching assistant shes been there 7 years plus.
She is also under occupational health. Whilst up to now they have been happy with her only working part time they have now informed her that they do not employ part time staff and she has been asked to go to a meeting with the busniess manager and the head of the school. The ruling on employment of PT staff is from the board of governors. They have only just given her a new timetable still at PT hours. Where we are concerned is that she is actually paid by the county council and not by the school and surely any decision that is made the CC should be involved due to her pension etc. She is also in the GMB union as well and has asked for their advice. Which she is waiting to hear back from them.
If they do turn round and say enough is enough how would she stand, plus im of the understanding they cant end her employment without a independent medical examination by occupational health If they do this and she is found to be unfit for work althou she is ok Part time but she wouldnt be able to work full time at moment. The consultant has given her a diagnois which would take forever to explain but basically its a functional disorder of the nerves. She is only been paid for the Part time work she does. I understand that they would need a full time person to do her job as theyre not obviously going to employ 2 part time staff. But its the fact that she is employed by the county council yet the board of governors at the school seem to have the final say. If the worst happens and they do say after any tests etc sorry but off you go how would she stand.