ESA Support Group and job interview

My wife is in the ESA support group and claims for us both as a couple. She has severe mental health problems, aspergers and physical disabilities. She attends hospital almost everyday due to various medical conditions and is in no fit state for work. However she has just applied for job by sending a CV and has an interview tomorrow as part of a guaranteed interview scheme. When I asked why she wants to go she said she wants to see what interview would be like and if she could manage it. She was medically retired from last job and has become very ill since. We have been living in fear of DWP since we had malicious reports triggering compliance interviews which caused her to become suicidal. We have a very bleak existence and my wife is terrified of PIP assessment as she currently has lifetime award of DLA. She is frightened of money being stopped and us having no money and neither of of us have any family or friends.

My question is if she does go for this interview could this cause problems for us? It's a job in civil service and they asked for NI number. She wants to experience going for interview and doesn't think she would get job and would fail medical. Its sounds pointless but she is so frightened about having DLA stopped and not getting PIP she is worried about whether she would be forced to get a job and not be capable. It is understandable in context of her horrendous life experience and illness.