You will need a third party sync. Or get access to her calendar through a remote program. She can share her calendar through Google however you will not be able to make any changes or updates to the calendar.
Microsoft now have a new program out I believe it is Microsoft Office 360 that you should allow you to share Office (including Outlook) products however it is Beta and I am not sure about all the bells and whistles.
Thanks for your response. I will look at that program.
Does anyone else know of a good 3rd party program to share? I've seen a few but do not just want to download some random program without hearing more about it.