I see your using something MC, a soil nutrient loaded soil?
If so, steer clear of run off. You don't need, nor what that with soil. If you do get run off, best to let the plant drink it back.
As you said in your diary update. Your pot was dried out. So, my bet will be under. And she's showing light signs of needing water. As if she was badly needing, her leafs would be limp. But, as stork said. If its a case of under. You'll see her bounce back within 30m or so.
Also a good way to tell if you're not giving enough water. If you see it travels thru your sub really quickly and pisses out the end. She needs more.