I freaked out right before I started college, and so did my mom.
Are you the oldest? She must be thinking about so many things: your growing up, her age, your future, her past, lots and lots of things. If you can keep in mind that she is having some trouble going through this transition, you may be able to help her. I know it's kind of the "reverse" of how it "should" be, but sometimes it's the kids who have to be the parents. Know what I mean?
"Be on your guard! Jerks on the loose!"
http://www.roches.com/television/ss83kod.html
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"If any relationship involves a flow chart, get out of it...FAST!"
~ Best12Bars