I don't know, someone else mentioned it first.
LEO do give stuffed andimals to children who are being removed from bad situations and blankets too.
The cops have now spent several hours with her and most of 'em on the job any length of time have likely seen it all.
It might just be that w/o her human/material props to fall back on, the girl was forced to be honest w/herself for the first time in her life.
Maybe the bear was a small reward for same...
(then again, i'm a guy, and a sucker for happy endings ;-)