Dave
Abigail won't be able to get insurance until she has a date for her mod2.
I tried to get my Diversion insured so it could be delivered to my home so it would be ready for me to ride once I'd passed my mod2.
I was told that they would only consider insurance once I had a mod2 date.
The only option is to try and get it insured under her home insurance, (costly!) or for you to add it as a second bike so you can ride it.
Mind it might well be worth talking to the insurance company as it was 3 years ago and they might have changed their policy.