Sleep Training Tips?

Anyone have sleep training tips? My LO is 11 months and will not fall asleep without being held and rocked. We did the Ferber method when she was 6 months and it worked great. She started teething real bad about 2ish months ago and all that went out the window. I've tried doing Ferber again but she now makes herself throw up when she is super upset/crying hard. She is now starting to wake multiple times in the middle of the night and I'm slowly losing my mind.

Edit: We have had the same bedtime routine since she was 6 weeks old so she knows that it's time for bed