I heard she was spotted by a bulldozer driver. This is rumor only. My husband works for a different waste company in the area, and that is what was being said there. They don't really "process" the load after a truck leaves.
On Republic's website, trash pickup for Bedford is Monday/Thursday on one side, and Tuesday/Friday on the other. If she arrived Wednesday afternoon, she most likely would've been in a dumpster from another town like Arlington, which lists trash pickups on Wednesday/Saturday as well. If she was in a dumpster in Bedford, it was most likely on a Tuesday route.
http://site.republicservices.com/site/north-central-texas/en/pages/cities.aspx#
Edit: What I mean by they don't process a load is that they generally don't have people out there walking around, checking the trash. The dozer drivers see things and remove what shouldn't be there at times, but that's usually it. Republic might do things differently than my husband's company. I'm only going by what they do at the landfills they use, and my experiences with a city landfill many moons ago.