Well, I finally found her.
She was on top of a dresser in my closet that had a couple of stacked DVDs and CDs. I just don't understand how she managed to get up there because there's not a single thing by it, no sticks or boxes or anything that could've possibly helped her climb something so tall and smooth, there wasn't any holes on/in it that could've helped her either.
Whatever though, I finally found her and I'm glad she's fine and back in her enclosure. Found her around 12:30, about 3 hours ago.
At the moment I have a large, heavy book on the right side and a guitar pedal on the left that weighs about 10 pounds on the lid. I was planning on buying one of these but I didn't think they were so cheap. Would that 30 gallon clip work for a 10 gallon tank? (Never mind, just read "fits 29 gallon and smaller") I'm assuming they're pretty reliable.