She isn't failing to mention things that might be useful to spare his feelings, that seems like it'd make it kind of pointless to have it be her doing it. She will have lots of opinions.
Fundamentally, Spellcraft is about anticipating the ways that magic hung in any particular state is obviously going to behave, so that you can move it to desired states without it thinning out, swinging wildly, sticking to other parts of itself, curling up, etcetera. Once you understand exactly how the magic is going to behave the way you understand how your own fingers are going to behave,, the way you can reach out for something without calculating exactly how far your hands have to travel to get there, then you're going to be able to cast more or less any spell you've seen the structure for. Obviously there are lots of explicit heuristics that can be taught, and a good understanding of tension and flows and the way attraction-that-falls-away-with-the-square-of-distance makes things behave, but you also have to get an intuition for it.
It'd be really nice if he could cast Arcane Sight and see what she sees,, but she can't think of any way to do it. ...maybe he could sell a devil a millionth of his soul for Arcane Sight.