Does not Outlook have a backup utility you can download. Then all you have to do is after you close outlook make a backup and place it in the shared folder- then all she has to do is restore from the backup on her account- that way it will kind of maintain
2 of the same account. Unsure if it would work for what you are doing- But it is a way I worked around having multiple boot partitions and multiple outlooks so to speak for keeping all of them on the same sheet of music.
For me since I test I save my backup to a totally different partition seperate from the operating system so that in the event I have to reinstall or crash I don't loose all my data.