She's not "propped up". She's snuggled up on the sofa in a blanket, with a beanbag or pouffe or something next to her in case she rolls in her sleep. In the middle of a room full of people, so it's not as though anything terrible is likely to happen. And the dog has come and curled up next to her which is rather sweet.
OK, yes, I suppose falling asleep with a bottle isn't ideal for tooth development but it's hardly worth an Internet rant. And if she doesn't have teeth yet then even that's unlikely to be an issue.