my input is only anecdotal I'm afraid. we had a person who was incapable of doing their job through lack of fitness, inability to do the work (trade gp1 fitter) and persistent malingering. said person was declared non-effective. IIRC this opened the door to get another bod in as well as said person to do the work.
from what you've said in the OP, it doesn't sound like your friend is a malingerer. my advice is she make an appt with the Chf Clk to [politely] ask what this means, both in terms of postings and SJAR/career impacts. assuming your friend is usually a good egg, any reasonable 1RO/2RO should be able to make a positive supporting comment on the O/SJAR. when i was downgraded following a serious accident, my 2RO commented on my attitude to fitness and determination to get upgraded so as not to adversely affect my career.
chf clk can give the definitive advice - don't be aggressive about it, be polite!