My nephews did this... So my sister made a new 'bed-time' routine. The boys would drink their final sippy cup of milk on the couch while mom and dad got ready for bed. Once they were finished they would all brush their teeth together. The boys would get tucked in and have a story read to them. That's it... It took them awhile to get adjusted to it, but after a few nights and bumps later it really worked out. Hope the best for you!!

I do not like sippycups. My son made a big mess with them because he liked to play with them.
When he came off the bottle I bought some 3oz plastic cups. when he had a drink it was sitting in a chair at first until he learned not to spill. After he had his last cup of milk or juice at night. He brushed his teeth and got ready for bed. I vkept a cup of watter in the bedroom and if he wanted a drink after bedtime he got a drink of watter and that was it.
Several bad nights at first and then no problems.

Bob

I like the ideas of giving her the cup before bed so the teeth can be brushed. Did you by any chance dilute the amount of milk in the cup or switch straightaway to water? I would try another approach with that....If you give 6 oz of milk, for the next 3 nights give 5 oz milk 1 oz water. Then for the next 3 nights, give 4 oz milk 2 oz water. Every 3 nights, give less milk, more water until she either gives it up or is just getting water. Either it's a comfort thing and she'll take the water eventually or she'll decide it's not worth it to bother and give it up. It's more gradual so it'll take some time but more gentle for her. The other option is to just decrease the amount of milk every 3 nights. Do 6 oz, then 5 oz, then 4oz until no more in the cup. Heck, just give her the cup if you need to (comfort item).

Ultimately, whatever you DO decide to do, stick with it for at least 2 weeks. She is going to test test test you and her behavior is going to get worse trying to test you before she realizes that you are SERIOUS. Then she'll start to comply. DO NOT give up when she gets worse as it makes the next attempt at anything harder. That's why if you say you are going to commit to a plan for 2 weeks, it'll probably not take that long but to think it's going to work in one night, probably won't cut it either. Good luck!

If you cannot break the sippycup thing try adding water instead. Give while sitting in the bed, read a book to her and when she has finished the milk take it away hide a sippycup of water in bed, don't offer let her find it.
The problem isn't just her teeth though. Children link items to sleep. For instance some won't sleep without a toy or a dummy or in your case a sippycup. Most things like this don't cause any harm and if you are willing to wait it out will drop off itself.

Make a routine and stick to that every night

bath time, getting dressed, drinking milk while reading a story and going to sleep. It will be very hard at the start and won't get easy for a while, but if you stick to it it will eventually get better.

If you do start something new and than give in you will be sending the message that you will give in for curtain behaviors and it will just get worst, whatever you chose to do stick with it.
And good luck.

Rita

MY STEP SON DIDNT LIKE WATER TO MUCH AT BED TIME SO WE GOT HIM FLAVORED WATER. HE LOVES IT.

I sympathize with the situation of the sippy cup. We had this problem with our first daughter and learned from it. We ended up just adding water to the cup, even though she didn't like it at first, we kept to our guns and she eventually relented.

Does your daughter get water in the cup during the day or just milk? Maybe if you can designate a cup just for nighttime and water? Just an idea.

Hopefully this works itself out soon.

I tried giving my daughter water in her bottle at night. She took it out of her mouth, looked at it like what the heck, then started wailing. So I know what that is like:) Sorry, dont have any suggestions, just sympathy!