Like the other poster said, I don't want to sound cold either, but you have asked for opinions. So, I was a tad shocked to learn that your daughter will soon be 3 and is still on the bottle. Yes, I'm sure you will have a few days of tantrums and "bottle wanting," but believe me, this won't be the only thing in your daughter's life that you will have to be tough on. Honestly, it will hurt you more (not having the crutch to fall back on) than it will hurt her.
Having just taken my younger daughter to the dentist for the first time, my pediatric dentist said that about 50% of his patients my daughter's age have cavities! And, he said we live in an affluent area with floridated water. He basically said it's due to too many kids having the bottle too long....especially when going to bed. Just something to think about.
Good luck to you!