The first thing I would do is copy, all of FTM files to a new directory. It has been some time since I used FTM 2006, but I know they are all in one directory, unless she has changed them.
On The Copies of the originals try to open them. I would start with the is an Auto back up file. As I remember there are several back up files. if she has been using FTM for any time period. If this does not work try the next back, then next, etc.
As I remember there as also a repair facility in FTM 2006. I have used it so you may try that.