You seem like a very knowledgeable user. In my experience, copying a PAF data file and finding that my most recent entries are missing usually means that I copied an older version of the file. Maybe I am just lucky, but I have found PAF to be totally realiable.
You might find Dropbox really useful. A 2GB account is free and can be installed on multiple computers, and it will automatically sych all files saved in your dropbox folder files across all of the computers. (There is no need to set uo complicated synching rules ... it happens automatically.) I f you save your PAF file in your Public folder in Dropbox, your daughter will always have access to your latest data.
In my case, I moved my PAF data files to Dropbox so that I can edit them from any of our computers. I also put a PAF-generated website in my Public Dropbox folder ... it is probably the easiest way I have ever found to put a website online.
Incidentally, when I make backups I save them to my local computers. My main databases are in "the cloud". If my house burns down, at least no data will be lost.