I do wonder if this is why she is always going on about her different conditions as they would surely ask how she is able to write/present/cook, who knows...Sorry if this has already been done but pip is extremely hard to apply for and get. Mr ogre is blind and had to jump through many hoops, he's now getting left alone for quite a while but for someone who fears the post so much, the dwp sends out a lot of mail (which is left up to me to read as they don't make any exceptions for visually impaired). I would dread the seemingly countless requests for reviews and appointments. So it would be hard for her to prove she has these conditions if she's only ever seen a gp. We have realms of hospital reports as evidence and they demand more and face to face assessments.
Sorry for the long rant if you've got this far!