There might be someone missing that she used to work with. Someone with killer editing skills, excellent taste and wit. Manuela Pavesi comes to mind. Sometimes the people behind the scenes are the ones that come up with the best ideas that the audience ends up loving.
Also it may be hard for her to stay relevant, as she no longer is the only one doing the Prada look. Her past work has become fashionable, and everybody else does fashion the same way she used to do it, aka mixing a bit of utilitarian sport elements, a bit of vintage, a bit of "fashionized" non-fashion items, a touch of ugly and unsexy... and voilà, the Prada style is there.
As was mentioned, she should really try to forget about trends, forget about instagram and really question what she would like to wear and what her (former) clients would like to wear now. Make something chic and different, and see if any of that old Prada magic appears there.