Isabel is telekinetic and capable of manipulating a number of objects at a time.

She's capable of creating a force field that will stop anything dangerous from touching her, i.e. flames, thrown things, etc.

She can also manipulate and change matter just by touching it and concentrating. She's very, very skilled at that.

It's also canon (at least per the Roswell post series books) that she can cause hair to grow, be it facial or a head of hair.