I think you have been given a lot of good advice. You have really gotten yourself into a pickle. When you get scared you can make it worse. I was going to tell you to immediately pay at a minimum $200, but it's too late for all of that. The more you do and say without legal counsel the worse it gets. At this stage, talk to a lawyer immediately and take what money you have to pay the attorney. Any more statements you make, and actions you take, could make it worse for you. I don't condone what you did, it was VERY poor judgment. I can see you want to do the right thing, but right now the salon is holding all the cards and you could get arrested. A lawyer may be able to negotiate on your behalf and resolve it.
It sounds like several days have gone by now since this happened and the more time the worse it looks for you. Now you've called the salon and made incriminating statements, spoken with a police detective and set an appointment you won't honor...it's getting worse. GET AN ATTORNEY! You need to have someone on your side, so you can stop looking over your shoulder wondering when they'll come after you or whether your freedom and livelihood is at risk. The attorney may be able to make the payment for you and have them sign something to squash this matter. He or she may let the salon know that if you're in jail and lose your job you won't be able to pay them. If they take you to court over an amount you're willing to pay, they'll lose time out of their lives going to court, etc.
Let a lawyer work it out for you, so you can have some peace of mind. I can't imagine how stressed out you have been over this whole thing. Do the right thing, and make some smart decisions now before it gets worse. Good luck!