Hi Doug,
I'd suggest moving your current installation to your daughter's computer so the setup is the same (be sure to install any USB to serial drivers needed), then when you get back, move it back to your existing machine. If nothing has changed on your existing machine, you'll only need to move back the WeatherCatData folder.
When moving to your daughter's machine, turn off any on-line services in WeatherCat so it doesn't try to upload (simple web, custom web, CWOP, Wunderground etc) unless you want it to, but I'm guessing it'll only be running sporadically.
When you do get back and move it all back to your machine, it'll upload the missing data to Wunderground - this will probably take quite a while, but happens in the background (unless you turn off the 'Enable Historical Uploads' tick-box in its Wunderground preferences).
Details of moving from one machine to another can be found on the wiki at:
http://wiki.trixology.com/index.php/Moving_a_WeatherCat_installation_from_one_computer_to_another