Help re transfer from dla to pip

Could anybody please advise my partner has been asked by DWP to complete and return PIP application as she is currently on DLA
My query is she is currently appealing against withdrawal of esa as part of the paperwork from DWP there is a reply from a gp at her practice who she has never seen the form only outlines one of her conditions from several years ago and makes no mention of her severe ongoing issues which are the basis of the appeal we spoke to the practice who stated the dr in under no obligation to fully fill out the form with all issues unless the DWP ask them to do so
Should we mention this on the pip form in case pip try to use it as part of their process clearly we have submitted all of our medical reports etc