Could I get in big trouble for this? What should I do?

You are already in big trouble. I bet you haven't had a good night's sleep in days and I bet you haven't been able to eat or concentrate on anything other than this. It might seem nobel to go to the store but: What are you expecting from the stores when you go back and try to pay for the things you stole??? A big hug and a big "oh thank you for being such a good person" cause sweetie that ain't happening. You could find yourself arrested for theft taken away by the cops and you'll be in jail for a day until your tearful parents come to bail you out. Or longer if they decided that a few days in jail will teach you a valuable lesson. And kiss whatever future you have planned good bye -because you now have a criminal record. The stores don't have to accept your money no matter how remorseful you are and they have every right to have you punished since you did sort of break the law.

You need to stop hanging out with this person right away. Never go shopping with her again. She's not worth it. Don't tell her off or threaten her because she's the kind who will lash out at you. Don't get her mad at you because she might turn you in to be spiteful. And you probably don't need to turn her in, she will eventually be caught. She's gotten away with it so often that she's going to slip up soon and get caught and you don't want to be with her when she does. Girls like her get arrogant and feel like they will never get caught -and that's when they slip up and get caught. You do need to talk to a trusted adult when you get to school tomoprrow. If your guilt is too much ask a trusted teacher what to do about a friend you have who steals. Don't use names, don't go into details about your involvement - the teacher will probably be smart enough to read between the lines of your story. He/she might have good advice, better than anything you get from Yahoo answers. If you school has a guidance department or counselors then talk to them. They have probably handled this situation before.

As for the things you stole: put them in a plain brown bubble wrap lined envelope, these are available at dollar stores and they don't ask questions so don't be stupid and try to explain things to the cashier in the dollar store -they don't care. Put the store's address on the envelope and no return address, put in the stuff you stole, lots of stamps and pop it in the mail with a letter explaining what happened. Do not sign the letter! And never go into that store again -at least for a few years.

The two obvious things you need to do

1. Drop her as a friend or at least don't go shopping with her.

I wouldn't want to be with her when it happens again, and you know it will.

Someone else suggested you give her a "second chance". But she's already had that, and a third and fourth, from what you've said -- "she does this every time she goes".

2. Stop stealing yourself if you do go.

If you report her now, after the fact, I'm not sure what would happen.

But you need to realize that you're heading down the same path. Don't let peer pressure ruin your future.

Jail time will Fix it :) have fun in Jail :)