I ordered Valbazen online, the directions for mixing according to bodyweight was included on the bottle....It did the trick for my little flock. It's about that time again....Oh, it may take a few days to notice a change....
Could she be egg-bound? When you say her tail is "tucked up," I'm not sure what you're meaning - Does she appear to be straining or pumping her tail?
Is she beginning a molt?