I did not get the impression that any of this was about her not knowing the rules, but rather about her trying to make the game work a certain way but just not having the experience yet to do that smoothly.I disagree. If a GM is re-writing the rules as they go that's a far stretch from, they are just learning the game. IMO I'd tell them, "You should read the rule books". I'm not saying you need an encyclopedic knowledge of them, but you should at least have a passing knowledge of them. If everyone at the table reads the rules it puts everyone on a level playing field in the sense that they have a good idea of how their actions should play out. A new GM if they have read the rules of the game should be able to make rulings within those guidelines, not just make something up whole cloth out of thin air. Whether someone has been GMing for 40 years or for 3 sessions should not remove the onus on them to learn the rules of the game.
That said, I am a RTFM person. Everyone should, not least the old veteran GMs who think they already know how to do it. In my experience, the younger GMs are far more likely to study the rules.