Listen, as someone who worked for a very long time in media and hit the boardroom pretty young much to the apparent shock of the gentle-bred ladies around me, she is going to find that if she wants to work in any form of media, she will hit unbelievably tough, gritty, experienced competitors who are used to having to graft for it and elbow all the Sophies and Emmas with their 'but I don't want to read all weekend, I do have a LIFE you know' out of the way pretty sharpish.
As others have said, waitressing, bartending, cleaning are all extremely valuable life skills that knock the privileged edges off. Honestly, all the unbelievably privileged people I worked with in a media industry people are desperate to get into (and usually fail) just couldn't fathom that they were meant to work THAT hard for THAT little money for SUCH insane hours and would it perhaps help if mummy had a word and explained about how important the lacrosse tournament really was? My boss actually SAID to me 'thank god you're not a Sophie or Emma'. That's literally what the senior management called them which is awful but so is most of life.
You'd better get ready now to save the money for a two bedroom flat (I'm being completely serious here, if you want to proceed the way you've described) as she'll need to live in one bedroom and rent out the other to stay financially afloat, as all the good jobs will have been taken by tough, ruthless little cookies who need to get them to survive and who will be able to demonstrate their ability to multitask, do the shit jobs, make the tea, carry out responsible errands, go without, stay late, start early, go the extra mile, manage difficult people, find solutions, commute, live in a dump etc etc etc because they'll likely have already been doing all those things for years.
You say you're both head teachers, but media is NOTHING like schools, I've seen enough ex headgirls almost faint in shock at the fact that the rules are: there are no rules except ruthlessness and hard work. You will not be there to say 'now little Johnny, give my Amelia a chance now, she really does want it you know despite being tired from having to walk to the office'.
You say people are cruel, you ain't seen nothing yet if she's going to be a journalist! Update us in a few years.
NB the only reason I have the time to type this is because I FINALLY can work freelance after 20 years in the biz, and because even though I am quite tough, the day I found myself in the office thinking 'oh how I WISH I was just a sociopath like XYZ, everything would be so much more do-able' was the day that tolled the end.
PS honestly from everything you've been saying it sounds like you'd be much happier if she got a corporate grad programme in a nice safe industry somewhere.