Congratulations on the find! But as you say, finding this information does lead to more questions. From the records I have looked at in this collection I believe the 1827 date is the date of Freedom. Castice is a race delineation sometimes also called Castee. Have you tried looking for other records such as the Census for 1841 or later to try to find her and other family members. Also try this website - http://www.vifamilies.org
for additional info on your family name. Good luck!