Lulled (verb) – to put to sleep or rest by soothing means: to lull a child by singing.

http://www.dictionary.com/browse/lulled

Quicksand chapter 8, page 75.

“Again she had had that strange transforming experience, this time not so fleetingly, that magic sense of having come home. Harlem, teeming black Harlem, had welcomed her and lulled her into something that was she was certain peace and contentment.”

As we know Helga can’t stay in one place for a long time. And this place she moved to was better and she felt comfortable as a child who gets lulled by his/her sleep.