Well I didn't do like one chore and now she's not talking to me. Like when this happens it hurts a lot inside and I hate it. She starts yelling at about really dumb stuff. For example, I've just been keeping my mouth shut just so I don't get into anymore trouble and she got really mad and told me to keep it up? So I'm basically confused and pretty much broken down. What do I do?

I know you are young but the only problems get resolved is to talk about. What you are trying to do is guess at how she feels or why. Talk to your mom as a person and you might be surprised. Either that or you have to contingue to guess. Keep in mind adults get stressed for all kinds of reasons so allow for this too.

It could be any number of things including fear. She may be afraid to express herself if she's worried about something and trying to figure out how to make things right. Many companies have rumors running in them and some are true about impending closings. In this economy she may be one of them and she's worried but afraid to say. And the fall out is she may be taking it out on you. Just be aware of things going on and show her lots of love and support. Try not to ask for extra or expensive things at this time.

Is it really one chore you skipped or "like" a chore, meaning more than one but in rounding you would round down?
Sounds like your mother has you where she wants you.
Needing her approval. Which is natural. You are her daughter.
Just do what you're suppose to then ask why she is isn't talking to you.
Let her know it hurts your feelings when she does not speak to you but will only speak to you, rather sarcastically and angrily at you (from the way I read your info)
Be honest but polite and respectful