K.S.
Well, I'd say that it took nine years to teach your daughter that it was okay to sleep in your bed so it's going to be rough unringing that bell. I would calmly explain to her that she will be sleeping in her own bed from this moment on. And then stick with it. If this means that she cries and screams for hours and makes herself throw up for a night or two, then that's what it is going to take. It'll be rough on you and the entire family, but as soon as she realizes that you are completely serious and committed - she will sleep in her own bed.
I'd pick a good night to do this. Perhaps when your son can spend the night at a friend's house and neither you nor your husband have to work the next day. (Cause nobody will be getting a goodnight's sleep.) If you want to start out laying with her in her bed until she falls asleep - I'd say that's fine, but let her know that you WILL be locking your door. Then I would recommend you invest in ear plugs and a fan (for the white noise) OR, if you don't think you're strong enough - leave the house to your husband for the night and go sleep at a family member, friend or hotel. If you are going to make the decision to do it, you need to MAKE the decision that you are going to do it. Your half-hearted efforts over the years have only taught your daughter that she REALLY needs to freak out to get what she wants. If you are not going to make the decision to do it, then stop bribing or cajoling her - there's nothing you are going to offer her that will work. Either invest in a bigger bed and resign yourself to co-sleeping for a few more years, or just move her to her own bed each time you find her in yours.