Never, ever be afraid of the word "said". It's magical. It gets the job done, yet is so commonplace it enters the reader's mind without leaving any conscious impression. I know it looks repetitive to see all those "saids" lined up, but in fact they seldom register. And said just about never require any kind of amplification, modification, or specification; certainly not anything that is intended to reveal the state of mind of the speaker. The speech itself is supposed to do that."Whisper", "shout", and similar replacements are OK if the physical mode of speech is distinctive. Adverbs are almost always unwelcome, especially if they describe the state of mind of anyone else but the POV character. "Haven't seem him since yesterday," she said slyly. OK, if it's *not* the POV character speaking, then how does the POV character *know* the speaker is being sly?
Try to make the dialog stand on its own, and not tell the reader the conclusion to draw ("... a resounding bombardment of screeching frustration from a teen girl..."), because people don't believe conclusions that are handed to them. The explanation eclipses the dialog, which you don't want. Keep it simple, simple, simple:
“Mom! I don’t want to go! I hate going! Uncle Rayel is too weird. He’s not even my real uncle! Why do I have to waste a good Saturday pretending I like being around him?” Bree said.
“Get dressed! Wash your face! Get your stuff! And you will go over to your Uncle’s and be a civil young lady! You hear me! Civil!” her mother said
What I did here was eliminate the stuff which you added to your dialog because you didn't have faith in it (well I also fixed a typo). Stripped of that stuff, the conflict between Bree and her mother pops out much more clearly, in my opinion. It also lays bare the challenge you have in front of you: to make something so commonplace as an emotional outburst by a teenager interesting. Maybe something like this:
“Mom! I don’t want to go! Uncle Rayel isn't even my real uncle! Why do I have to waste a good Saturday pretending I like being around him?” Bree said.
“You will go over to your Uncle’s and be a civil young lady! You hear me! Civil!” her mother said.
"But he's so weird," Bree said.
Her mother hesitated. "Just wash your face and get your things together," she commanded.
[This message has been edited by MattLeo (edited December 03, 2010).]