Not sure how much E would be in 4 pea size doses, you would have to look at your label to somewhat calculate that.
Usually with the pastes, 1cc paste contains 200UI Vitamin E, so likely not enough, so I would switch back to giving the 400IU Vitamin E that way you know she's getting it.
Denagard only treats Mycoplasma in poultry.
Does she have other symptoms like mucous, bubbles in the eyes, etc.?
She may be wheezy/raspy because she's immobile and possibly she's aspirated a bit of fluids, hard to know.
Tylan or a Tetracycline may be a better choice, but if you have the Denagard, then try it and see if it helps. I hear it's very bitter, so you will want to sweeten it with Karo Syrup or Juice.