I bet she would eventually have moved the school back to the Tiernsee. The magic would not have been recaptured. :( The stories would continue in the formulaic style of the Swiss books (though at least they would no longer be so physically constrained to the Platz, a purpose-built CS expat miniature community) with the odd descent into sheer madness eg Miss Annersley threatened at gunpoint, Kathie Ferrars leaping from one motorboat to the next like James Bond. She would have a difficult time deciding how to combine Len's degree and marriage, which I would expect to yield another 'long' family, and would probably really struggle to allow anyone to retire, even Matey who must be about 90 by this point.
Or maybe she would have gone back and filled in some gaps - wasn't Tom written totally out of sequence, for example? The Austrian books are full of gaps which would probably be fairly easy to fill (and often it sounds as though she'd once had an idea what had happened in between books anyway); the wartime books also have some funny gaps but i think bridging these would be far more complicated.
Joey is just supposed to be too all-encompassing. So many of the other characters are really well-developed and plausible and I think they benefit from a sort of authorial benign neglect - she just takes them as they are and uses them (mostly) appropriately, whereas Jo is deliberately cultivated into something altogether less convincing. So, whereas I can happily ignore Bill's speech about the importance of domesticating girls in Camp, or describe the process of Madge becoming distant and a rather rubbish parent in the later books as an aberration, I never feel I really have a fix on which is the 'real' Jo and what isn't. (Bad bad English there, Miss Annersley would despair.)
What would you have done with Robin instead, Joey? Remember my lamb that Dr Jem doesn't think she should have a family because she is too delicate. I quite like to imagine that she basically becomes one of the nuns in Call The Midwife - this is probably my only cultural point of reference for nuns, mind.
Supposedly, my planned collection will only go up as far as Gay, or maybe Three Go at a push, plus a v select few thereafter (Tom, Oberland, New Mistress and Reunion). I don't know if I really will stop there, or if some sense of compulsion will push me on to the whole set. It will be a good while before I have to cross that bridge - logically, I know a lot of the books I dont really want to own a good copy of are also the most expensive so it would be a doubly stupid idea to buy them, but I can imagine 20-25 books looking somehow incomplete.