Cara's not so much with the spellcasting, but she does have a couple of magic-based abilities thanks to the whole Mord'Sith thing.

Firstly, she can turn magic that's cast against her (or someone she's close enough to to get between them and the magic) and magical weapons back against their user, though she seems to need her hands free to do this.

Second, she can raise the (recently) dead with the Breath of Life. The exact limitations on this are fuzzy and plot-related, but basic rule of thumb seems to be that the deceased needs to be pretty fresh, not too extensively damaged, and the windpipe (and presumably at least one lung) needs to be intact.