What type of thermometer are you using to check the temps? Doesn't sound like she is spending much time in the basking area and if that's true, that will affect digestion and the pooping schedule.
I wouldn't recommend giving benefiber as you don't know what side effects your beardie could have from it.
For her age, she should be getting calcium 3 days a wk and vitamins 1 day a wk. You mentioned that the UV was "throughout the cooling area." The UVB should actually be right alongside a bright white basking bulb so your beardie can get the benefit of both bulbs at the same time. What brand UVB is it and what is the distance of it?
When you do the massage, it needs to be on the right side from armpit to vent area and in a gentle circular motion. You can actually also give 2 drops of vegetable oil. Does your beardie seem uncomfortable? Are the beard and/or tail darkened at all?