Depending upon the the length of time and assume the stress level is low, I have often seen patients "keep it together" so that present appearing that they do not have any emotional problems..A long interview- in other words a thorough psychiatric interview will usually not be able to hide the illness. It is very important that you describe the symptoms that you have observed and what set them off. If there are others that are aware of the illness see if you can get them to either testify or write an affidavit speaking to the symptoms of the illness. If she is on any meds get a court order to indicating what meds she is taking, similarly with any medical treatment including the interactions with the gp.
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