Okay... sorry! Here is the correct link for the school district... hoping it links right, if not you'll have to go back through to May of 2006, then go to Agenda that details the activities for each day. According to the agenda, Wednesday May 23rd was the last day for students... Monday, May 28th is listed as a Hybrid Teacher Workday, whatever that means I'm not familiar with that term.
http://www.transylvania.k12.nc.us/calendars/
Then... I was looking at weather for 2005-2006, and NOAA has snow detailed coverage maps. Seems we had a pretty mild winter that year... I don't remember I had a newborn and didn't get out much, LOL!
http://www.ncdc.noaa.gov/sotc/snow/2006/4
So who knows if/why she did lie, but why would you need a sub when school was out for the year?