What teeth are coming in? It could be that, or it could be that she is now used to coming in your room. It's hard, and now that she is 19 months, it may take a week... but, I suggest you don't take her out of her crib when you come in to comfort her. Come in, hug her over the railing. Lay her down, get her settled, and if she's stopped crying, leave the room. If she starts back up, wait 1 minute, and go in. Do the same thing. Don't talk to her, don't make eye contact, just hug, laydown, ssshhh pat and leave. Keep doing it, but wait 1 minute longer. I never go more than 5-7 minutes, because my daughter can get SO worked up that the point of what you're trying to do, and her actually even knowing what she's crying about anymore is totally lost in her meltdown. So, you may have to do it A LOT...in and out, in and out... But, she will get the message that she sleeps in her bed, and that you are there for her. So, if it's just habit and a little night time anxiety, this will take care of it. Again, you might be in and out of her room for an hour to an hour and a half depending on how her tempermant is. But, it'll decrease dramatically across the next several days. I'd start it on a Friday, so you have the three toughest days out of the way. Also, if it is teething, are you giving her some tylenol, or rather motrin before bed because it lasts longer. Because if it is teething, that will take care of that. Last question, how quickly do you go to her when she cries out. I'd suggest waiting 1-2 minutes to see if she'll settle herself. Sometimes my daughter will wake, cry out, fuss and squirm and fall right back asleep. Good luck, I know it is hard and even harder when you're sleepy!