Vahl has multiple races of different types.
Dark Elf (Dunmer)
Vahl was born with the ash heart of a Dunmer, so she has the inborn abilities of a Dunmer such as 50% resistance to heat and radiation, and can not die of old age.
Vahl was born with the blood and breath of a dragon, so she has the life abilities of a dragon such as learning the Way of the Voice, absorbing Dragon Souls, reading Elder Scrolls, and Shouting.
Vahl has become a member of the Circle and became a werewolf. She also is married to Farkas, who is also a werewolf. Vahl's lycanthropic abilities are the only ones out of all her racial powers that she was not born with.
Time Lord (Gallifreyan)
Vahl was born with Time Lord blood mixing with her Dragon blood, possibly due to distant Gallifreyan ancestry, so she has similar abilities to those of a Time Lord, such as summoning and piloting a TARDIS, creating and using a sonic screwdriver, and of course regeneration. Although Vahl has never been seen to regenerate on screen, the change in her appearance between episodes 7 and 8, and the photograph of a very ugly Dunmer which is allegedly Vahl shown in the latter episode indicates that Vahl underwent at least 2 regenerations during the long interval between episode 7 and episode 8. It is also possible that the Dunmer dubbed by Venturian as Ugly Vahl first seen in episode 141 is a future incarnation of Vahl.