I have never had this problem, but I am concerned for everyone in your family. Not only do you have concerns with your 2 yr old still taking a bottle in the night, but she is sleeping with you and you have another on the way. Try to get it taken care of before your new little one arrives. I would suggest that when she wakes up asking for her bottle, just give her a sip and that's it. Do this for maybe three nights (once a night) and then stop altogether. That way it is not cold turkey, but you aren't prolonging it either. You also need to get her sleeping in her own bed. I have a friend whose 4 yr old is still sleeping with them. It is going to hurt your marriage eventually. If you make these adjustments early in the child's life it will be easier. You may have a few crying and sleepless nights, but it is worth it. If you stick to your plan, it should be solved in just a few days.
(Just a side note for an example and encouragement: we were reluctant to give our children a pacifier when they were babies because I kept seeing 4 and 5 yr olds walking around with pacifiers in their mouths and I didn't want that. A friend of mine said that she felt that way with her first child and at age 12 that daughter was still sucking her thumb. With her next children, she gave them a pacifier so they wouldn't suck their thumbs, and then she took the pacifier away at age 10 months. There was one or two nights of extra crying, but then it was over. I tried it, and it worked. My children cried for one or two nights and never sucked their thumbs.)
I hope it works out well for you and your family.