Waiting for an update! How did the next lesson go? Better, I hope. I teach a lot of children, and I know a lot of screwed up parents, which I believe is your situation. It's surprising how many nervous, stern mothers say, "I don't know WHY little Susie can't relax. She's such a perfectionist." Of course, they say it in front of the child. I know who the perfectionist is. I can't change the adults. But I can kick them out of the studio while their children are playing, which helps tremendously. I make a real point not to use the words right and wrong to kids like that. Some children find that clarity helpful, but I'm talking about the ones whose lives are all about trying to get everything just right. For them, I've had luck with the following (hope this isn't too long):
I find something genuine to enjoy about the child's playing from the very first lessons. "I just love hearing you play because it feels so steady," or "you already know how to make so many different sounds and moods," anything that's REAL. Especially if it doesn't have to do with correct notes but more about good instincts or being brave, something that they don't have to strive to keep doing because they already have it. Then, in working together, instead of saying "that's right", I say, "that's beautiful", or interesting, exciting, whatever. Beauty is something of a judgment, but you can teach them to separate that from meaning right or perfect. We talk about the feelings in the music and their experience while playing it. I try to hint at things and let them come up with their own answers, rather than spelling out everything. Anything to get them out of the passive, performing-pet syndrome. If things really are wrong, I say, "How about...", or "Yes, now let's add one more thing: this note can be longer" etc. I also try to turn right and wrong into matters of taste. For example, if they make a mistake but the piece still works (like wrong rhythm but they didn't skip any beats, or wrong voicing but right chord), I observe that they made a little change, and how I like their version better, "but let's write in your way so what you're looking at always matches what you're playing". I mean, I'm not talking about re-writing Beethoven here, just young kids trying to get started who are already beaten down. And every little success, I calmly say, "I knew you could do it." I think it's better generally to be calmly cheerful in this situation, rather than rah-rah cheerleader, because their gauge of success should be (eventually) how they sound and what they're learning, rather than how excited the teacher is. I also ask what's the worst thing that can happen when they're afraid to try a new piece (because they will be). I take over the keyboard and pound something really horrible and ask if they think they can make a sound worse than that. They laugh, say no, then I shrug and say, "Go for it." I use words like bravery, courage, being bold, and taking risks. When I play for them, I make little mistakes on purpose, I laugh, "oops!" and keep going.
Last thing... One older girl who was completely bound up (still is a little, but much better), I finally asked one day, "What's the best compliment you can imagine after performing? What if someone came up to you and said, 'wow, that was so NICE, you hit all the right notes, no mistakes at all,' would that be the best thing someone could say to you?" She just stared at me, speechless. She bit her lip and thought, then said no. I asked her, "What if you made a big mistake that everyone heard but someone said how moving or how exciting it was, would you like that better?" She smiled and said yes, she'd much rather make it be special than play all the right notes. This girl is older, but even young children can appreciate deep ideas. For whatever it's worth...