good point about the difference between pro and amateur weigh ins. I didn't even think about it. Also watch things like salt intake and other activities that will cause extra water retention. Being a woman you have a harder time with the fluctuations than men due to menstural cycle and such.
My wife has been doing Jenny Craig and she has been losing anywhere from 2 to 4lbs a week. Not that I'd recommend Jenny but maybe some kind of controlled food diet might be an option too if it interests you.
I understand your reasons for wanting to drop the weight, I'm at about 205lbs right now and I'm 5' 8" which means most of the people I'd be fighting are going to mostly be over 6' tall and have a distinct reach advantage so I want to drop down to 185lbs myself. Though I want to give myself about another 6 to 8 months of training before I start seeking out amateur fights so I'm in no hurry at the moment.