with lice you can see them when you part her hair, they'll either be reddish or look white with black "heads". I have encountered this once with my nigi pygmy kid Angel, now she's white so they were easy to see. Dust with Sevin...available at most home centers like lowes or even tractor supply. You'll need to dust her sleeping area as well and for good measure dust ALL of your goats. Make sure they are not anemic by checking their eyelids, worm them if you feel the need and give them some molasses in their water, to boost their iron just in case.
My goats came with lice- I used Ivermectin but they kept coming back. Then I heard you need to re-treat in 10 days. I did that and it was pretty much the end of the lice problem. About once a year, I see them start to scratch and repeat the treatment. I just use horse paste worming for the ivermectin in the fall and winter- cheaper and easier to administer. I wish I could get rid of them permanently but I think they are in the shed wood or something- come winter I have a problem again.
My "kids" arrived with lice last spring. We had a brand new goat pen, fresh bedding, a paddock that hasn't seen other livestock in 15+ years.....now it would be infected and I had no clue what to do. On the advice of another goat person, I used Advantix for small-medium sized dogs & have not seen a single lice-looking thing since. When I posted this on another group, I got loads of comments indicating you should never put Advantix or Frontline (we have ticks really, really bad here too so it was dual-purpose) on a fiber goat as it can cause major health problems and damage their skin, but I haven't seen any ill effects.
Sorry I haven't been on here for a few days. She doesn't have lice, I checked her closely in the light all over. She is a large doe, and the goat feeder we use made the donkeys lose the hair on their necks. So that is what happened to her. When she puts her head in and out of the feeder the wood rubs it and some hair falls off. Thanks! At least I now know what to do if they have lice.