Once I get a look at her routine, I may be able to offer some advice there. For the sep anx, around 18 mo is when it often shows up again. We dealt with it off and on from 18-20 mo. I didn't want to stay in the room with Tyler and create a bad habit, and verbal reassurance from outside the door didn't help. I ended up doing the "in and out" technique. He'd cry, I'd make sure it wasn't just a quick protest cry (I could usually tell after a few seconds that it was going to escalate), I'd go in, say "night night, Tyler," lay him down (if he didn't do it on his own), put my hand on him for a few seconds, whisper "night night" again, and leave. I did it over and over and over until the phase passed. I always tried to reassure him from outside the door first, and if that didn't work, I'd start with the in and out routine. It's exhausting, but it worked for us and got us through the phase without creating any bad habits. HTH!