Heres an idea, What if you lock her in her stall & leave a TV on? about 5-10 feet infront of her stall.

I remember watching the discovery channel & farmers were installing tvs for their horses & cows to watch & listen to. I would put it on a calm channel like the weather network.

I did this for Axle my snapping turtle, as everyone knows they can be VERY agressive when scared. So with all the TV & radio I played hes NOT scared of any noise & has never tried to hurt me. I can even give him a nose to nose kiss & touch his face & anything else.