I feel the same as you, I used to think she was ok, were a similar age and were a similar pace etc and she seemed to be balancing things (nannying/studying/running) in a relatively realistic way.
I suspect she's keeping her hand in with the NHS as a long term insurance policy which is quite sensible, although I don't think she actually would need to work.
Influencing is one of those things that is a potentially ok platform to switch into a career, but it depends what type of influencer and what type of career. Someone like Charlie, even without her current "employment" I think wouldn't find her feed a hindrance to employment, and probably has some good examples of pitching/selling/organising etc that might help with some jobs.
I think also that a lot of influencers come from money anyway, which his how they managed to have such an aspirational lifestyle, so actually it's not the end of the world if the partnerships dry up.
Some people have their flash in a pan moment and earn a reasonable chunk, but not enough to live forever on, then disappear and assuming they haven't done anything too egregious on the net they will probably be ok. That pacer guy who felt someone up on the job even seems to have found other employment and seems to be sing pacing stuff. Even Jack Monroe seems to have found some sort of work that isn't twitter.