They did find a baby in a Dumpster at Harrah's about 10 years ago
http://www.reviewjournal.com/lvrj_home/2001/May-22-Tue-2001/news/16152334.html
Sadly, it is not unusual to find dead children in Dumpsters around here. Seems it happens all the time. So, that would make me think they have searched Dumpsters, or at least considered that angle. Rebeccaeee is right, though,
there are so many cameras, anyone dumping anything would be seen. And she's right that LVMPD is probably doing a lot behind the scenes they're not saying anything about.
Haven't heard of any searches for her. There is a group in town that does searches for people. They did one a few months ago for missing cab driver Keith Goldberg and one last month for missing man Robert Elsworth.