The city landfill ? The County landfill ?
No law enforcement officer would want to even consider this possibility, and I think it is pretty obvious why they wouldn't.
Her children were small, lawn trash bags are large, and waste containers are everywhere.
Possible scenario:
She smothers them, bags them, tosses them into a trash container she knows will be emptied on Monday morning.
She goes into hiding on Monday afternoon, possibly checks the containers to make sure the kids are gone while on the run.
Kids bodies are gone, dumpsters are empty, no need to run anymore. Walk around until caught.
Everything she did was well thought out and planned, meds or no meds. Making sure the kids would NEVER be found was also part of the plan.
I guess you can't get much "safer" than being buried and compacted under 5 feet of garbage. (and growing by the day)