We did some controlled crying with DD around 7 months and she was going to bed on her own and sleeping through the night. Now at 11 months we've been traveling for 6 weeks and everything's gone to hell. I've had to nurse her to sleep for the last two weeks and she was waking up multiple times. Now nursing to sleep isn't even working as she wakes up as soon as I put her down, no matter how long I hold her.

Did you have to re-sleep train at any point? Was it harder or easier than the first time? I'm terrified it's going to be worse because she's even more alert and stubborn now.