Var and T-bol are two of the mildest (androgenically speaking) steroids available. Technically, T-bol has a weaker androgenic rating, but androgenic ratings mean little, as they are not necessarily a reliable predictor of overall androgenic potency in all tissues.
Still, experience has shown both to be very mild, but keep in mind that even drugs with a very low androgenic rating can produce significant masculinizing side effects, especially when used over a prolonged period of time and even when used at low doses.
Records from East Germany's doping program, which detailed doses and timetables for use for all athletes, were obtained decades ago by the U.S government. All of the women were provided with T-bol, which was produced specifically because of its weak androgenic component. Doses were much lower than what some of you might think. While I can't remember exact dosages off the top of my head, I did see the dosing regimens for women in every sport (doses varied not by weight, age, or experience, but by sport), and from my remembrance, none of the women received more than 15 mg/day, and most were considerably below that. Oddly, the sports one would think required the highest doses--strength sports, such as shot putters--did not receive the highest doses, but I am getting off track.
The point is that even when using doses between 5-15 mg/day, MOST of the women suffered very noticeable and in some cases severe masculinization. Of course, many of these women used T-bol for many years, and while they did not use it year-round, the combined effects of years of use caused very significant masculinization.
Regardless, the effect AAS will have on women can vary substantially, with personal response playing a big role in how quickly a woman will experience androgenic side effects at a given dose.
With that said, whether or not she should use one or both is a personal decision. However, she should know how she responds to each before combining them, as she will not know what drug is doing what without prior experience.
The belief that women should not use more than one drug at a time is ill-founded, as the number of drugs employed is not an accurate indicator of how likely one is to experience androgenic side effects. What does matter is the total androgenic payload. If a woman responds to 2 drugs similarly in terms of androgenic side effects, what difference does it make if she uses 10 mg of both drugs or 20 mg of just one?
Just like men, who often prefer using moderate doses of multiple steroids, rather than just one at a large dose, women may also prefer to do likewise. So long as the combined androgenic payload does not exceed her comfort level, that is all that matters.