Oh, and Dude, so interesting that once you talked with your DD it turned out that the guitar frustration was secondary to the school one which she had not previously mentioned. I wonder,actually, if something happened at school to precipitate this morning's meltdown.
I also love that you are learning guitar along with your daughter. That seems like a great way to model the kinds of approaches we've discussed here. I wonder if I can come up with something we both want to learn. I have on occasion let him teach me things, chess for example, which he loves and I never truly learned how to play. In those situations, though, he just seems to be amused by my shortcomings rather than being inspired by my persistence! lol