Ewe lamb with droopy ear, 104 fever, low energy

[Lisac2051]

I bought a few sheep a couple of weeks ago, and one of them suddenly had a droopy ear. I examined it inside and out as best I could, and cannot see anything. Her inner eyelids are red on top and bottom. She is eating, but not with the gusto of the other sheep. I took her temp and it's a bit high. Any suggestions? A friend suggested Lysteria...