Wow! This has gotten pretty heated. The man came to this forum for HELP and yet most everyone here has an opinion about how he's handling himself rather than giving suggestions for new things to try FOR HIS DAUGHTER.
Dear Sir,
As a single mother, I can totally relate to your frustrations. I have 3 children - all in different grades varying from pre-k to 4th. All of their attitudes and perspectives and mannerisms are ALL DIFFERENT. I realize your child is older than my oldest one (which by the way is 9; about to be 10) and I too am guilty of "yelling". You are right... when the polite, but firm discussion is taken place and he/she says she'll change something, but doesn't... I mean, how many times do you sit down and have the same discussion in the same tone of voice when you KNOW it's not working. I don't want to spank my children either and I go to every other length before doing so. No, it's not nice to yell at one another, but we both know that after making it nice, raising of the voice and becoming more firm is a necessary step to reinforce the importance of the issue. Should you yell at her ALL THE TIME? Of course not! That will eventually lead to total destruction. I understand you feeling badly about yelling at her... but truth be known, we ALL yell at one point or another and most of us feel badly for it, but don't beat yourself up about it, just try to maintain your authority without going overboard. As for being mad or agitated with your wife, I think it's completely understandable. You aren't on the same team if one of you is "okay" with the situation while the other isn't.
As for possible solutions, I did agree with 1dayatatime... arrange a parent teacher conference WITH THE PRINCIPLE. Inform the principle that you have made numerous attempts to work with the teachers during the past few months in an effort to help your daughter and to stay informed of what's going on with her. Not that you should have to prove yourself to anyone there, but the school does need to know that you are there trying to help your daughter rather than just letting her do whatever she wants/needs to do. If she's been lying to you, you can pretty much guarantee that she's been lying to them as well. Your daughter needs to know that she's not in control here and on a dead end road if she continues this way. She needs to know that noone is going to allow her to fail - if they can help it. Meaning, the teachers, the principle, the parents all need to be on the same team to show her she's not in charge. Ask the school about their ISS program, if they have one. That's "In School Suspension". My district has a specific place for this that isn't far at all from the school. When assigned to ISS, they are required to be in that class at a certain time (which is generally BEFORE regular classes start), they eat lunch in that classroom, there is no talking allowed, no playing, no interacting of ANY kind with ANY ONE during the day... they work on their assignments, the teacher assigned to ISS will check it over to make sure it's done, and the teacher assigned gets the assignment back to their normal teacher for grading. It's worth checking in to.
My father was the same way... the rules were very simple actually. Make all passing grades (preferrably A/B honor roll) and stay out of trouble. Fail a class and begin tutoring until the next report card comes out and shows a passing grade. If passing, tutoring can be dropped, if failed again, tutoring maintains. Fail a grade level, go to summer school instead of hanging out with friends. Fail summer school, repeat the grade level and miss out on graduating with my friends. I too was in sports, so all these things weren't issues for me. I maintained an a/b average all of my years of school. Softball was my life and I wasn't about to jeopardize that. Is there something extra curricular that your daughter is passionate about that perhaps you could use as some type of leverage here?