R.M.
Mine always changed his patterns right before a bg milestone gain or growth spurt. You will have to retrain her to put herself back to sleep now. If you do it now, hopefully it will be easier next time she might start waking up again for teething or something. Try the No Cry Sleep Solution book, it will give advice on how to get them to learn to self-soothe. Whichever book or method you decide on, that is what she needs to learn to do. I hope things get better soon, you are so lucky she was sleeping so good already!