My mom wants me to go to basketball camp for 4 days but none of my friends are going and I really don't want to go. I tell her I don't want to go but she is forcing me... and also I have sleepovers all of that week so I would have to cancel all my plans!! How do I get out of this??

Unless your mom approved "your" plans you don't have plans, you have no choice you go to camp.

How old are you?
Sorry to tell you this, but if you are a minor, your mother can make you attend the basketball camp. Has she already paid for it? Can she get her money back? If the money is not an issue, I suggest that you try to talk to your mother one more time and explain how you feel about the situation. Maybe you should tell her that you want to talk to her about something, but you do not want to make her mad. Most mothers will probably vow that they will not get mad in order to get you to open up. Then as respectfully as you can, ask her why she wants you to go to the basketball camp. Maybe she wants you to participate in some sports activities. If she does then suggest another solution to the basketball camp i.e. something athletic/physical you can do to take the place of the camp. If she still insists on you going, then ask her if you can have a sleepover (during another week) with your friends to make up for the ones you will be missing.

If you cannot change her mind, maybe it will help you to accept the situation if you know why this camp is so important to her.