MortalitasiNecromancy is Benevenuta's specialist focus as a mage. She favours fire for preference (and therefore best practise) when it comes to elemental magic, and has no particular skills in the healing arts. She is also skilled in mundane arts of death - her particular focus being poisons and their antidotes, which she has studied extensively and takes great pride in.
Benevenuta is interested in knowledge for its own sake, pursuing her academic interests and other curiosities where she is able to; she is particularly interested in educating herself in physical combat and will likely take advantage of any opportunities that arise to do so in Skyhold, but presently has not had those opportunities in Nevarra. While she has no real interest in studying any kind of healing magic, she developed an interest in midwifery through a friendship she maintained with a midwife and has entertained the idea in the past that if she were obliged to reinvent herself (for some reason... it's normal to consider that you might need to abandon your entire life probably) she would be well-served apprenticing to such a woman as it's an unlikely hobby for a necromancer.
Generally speaking, Benevenuta is a nosy dabbler - there is little, given the chance, that she wouldn't try at least once to see if she liked it, and when presented with something she can't do, it is her instinct to try and prove she probably can. The obligations of the life she leads have limited the ways in which she can feasibly indulge this "anything you can do" attitude, but there it is. Her scholarship serves as a convenient smokescreen for her other activities, often; she is genuinely inclined that way, but sometimes it's just a matter of appearing to be studying while plotting someone's unpleasant but untraceable murder.
REVISED.