First, take a deep breath. It's going to be okay. These things happen. You need to understand the fact that what you did was an accident. Your mom might be mad, sure, but she loves you. I've definitely been in a situation close to this before. My mom told me not to do any type of tumbling in the house. While she was gone, I did and broke a very expensive lamp of hers. I decided to clean it up, vacuum the rug, pick up all glass shards, and even grab some of my allowance to pay for it. When she came home, she was surprised, then got mad. I was so scared that I lost her trust forever. But I didn't. She forgave me. And I believe that your mom will too. Telling someone something we did is always the hardest step to take. It's going to be difficult. I'm not saying that your mom is going to be just fine and happy that you spent that amount of money. I think she might get mad, maybe disappointed. It all depends on how she acts. But the situation can be better if you show her that you are truly sorry. Believe me, it will take time to earn the trust back. But it can be earned. You just need to tell her. Think about it, if she figures out that you spent this money before you tell her, she's obviously going to be mad that you didn't tell her and kept it as a secret. But if you tell her by yourself, she may be a little less harsh knowing that you came to her on your own free will. I believe in you! You got this!