It really is a bit much, I was fairly competent (i.e. throttle, clutch and all confidently under control) after maybe the first 3 hours on the bike. I'm contemplating going for the restricted licence and getting a Ninja 300 in maybe a year, insurance is too much without a no claims "bonus" otherwise I'd be looking to get it in under 6 months.
At least it's good to confirm that I do in fact love motorbikes, I'll be riding for a long time to come.
What is your wife looking to upgrade to?
Probably something like an older SV650 or GPZ500 - cheap and relatively easy to handle, good enough on the motorway. She'll be going directly for the direct A license (now that you can't auto upgrade, if you're old enough it makes the most sense). Insurance isn't too bad if you're over 25, if you're under 25 it's awful.