I will make one point, which is IF she decides on Tren I would STRONGLY recommend she obtain a baseline voice analysis/recording.
I believe this is particularly relevant since 19-nor AAS seem to have the strongest association with vocal changes in females and THAT is an important distinction because a "deeping of the voice" MAY be PERMANENT.
Lastly unless she has considerable cycle experience I would opt for the Var.
I would generally recommend var over tren any day, even for someone who has some experience. However I would ask why these two as the choice? What is the end result being sought? Tren definitely tends to be a better hardener while var can promote water retention. The downside of tren is that it is a much more aggressive androgen and IMO harsher on the body in general.
I agree with what everybody is saying. Stay AWAY from Tren. I would only give a physically fit active female anavar or primobolan. If one of them were competing in a high-level competition, I might use low dose test prop, gh, winny, or npp. Good luck and be safe!