The way I had her progression was cars to planes to MSes which she was rejected for because of her attitude, and in the canon it was common for Saber pilots to become MS pilots. And I did explain that she is not just a driver but a mechanic, working on those three different vehicle types. I did find the one thing I had an issue with was her age. So I made her 27 so as to remark that she has been in the military nearly a decade which is why she could branch off into several different things. Think of her as a Jane of All Trades but a master of none. She is no Ace pilot.