We got a bottle calf last year to raise as a lady ox. She has a herd of 8 goats for company, and one of them (Clyde) has apparently decided he is her special friend. Another (Sandy) has taken the lead in motherly rules teaching and discipline.
Connie (the cow) sleeps with the goats and they have trained her to be very careful with her hooves and tail. The usually roam the land together for the most part, but Connie also likes to spend some time grazing off by herself. After a bit of that, she will go search them out - tracking their trail with her nose to the ground until she finds them somewhere in 15 acres of woods.
The goats do ditch her if rain comes in and they run back to their house. That confused Connie when she was very young because she couldn't figure out why rain was a big deal and didn't know the terrain well enough to figure they'd take the quickest way back to their shed. The goats didn't wait for her, but Clyde stood with his head peeking out the door calling for her until she rejoined them.
If you start with a wether friend and limited roaming area when she is young, she should be able to learn about goats/rain without any distress - even if she is blind. If I was raising a blind calf I'd keep the area kind of small so she could hear and scent her buddy until she was confident in finding them when they vanished. And with a young wether you'd be doing much the same with him for the first 4 - 6 months anyway, getting him used to being petted and combed and following after you.
Once you are sure that they both have a strong desire to follow you and each other, I'd start taking them for walks to learn you land. With that kind of training, I'd think even a blind moo-girl would be comfortable navigating terrain like ours (15 hilly wooded acres with trails, fenced). Connie is is very reliant on her nose because most of the year the brush, trees and hills make spotting her goat friends by sight impossible. If she were to lose her sight today, I honestly think it would only take a month or two to get her back up to speed traveling our land.
And if the wether only has her for a buddy, he won't ditch her for anything but pouring rain.
I'd also think that Ellie would do fine with single ox training or with cow riding. We started cow riding work with Connie when she was a week old - just standing in cow riding position and walking along if she walked - and waiting for her to grow big enough for our feet to come off the ground. She also does pulling work with a collar made from and old bedsheet and Walmart sled. At 6 months old she could pull a good sized tree stump over snow. Can't see why a blind girl like Ellie would have any problem with this sort of stuff once she gets her bearings on your land. Learning to follow directions and work with your human doesn't require vision.
Another thing, most of our halter training with her was done by tying her halter rope to one of our young wethers. Buddy enjoyed leading her around and knew more than we did about how to communicate what was expected.
You're going to really enjoy having a pet cow, and even without sight she can be a tremendous contribution to your homestead. I'm so happy when a cow gets to go to that sort of home. Connie is actually a Freemartin (sterile female born twin to a male calf) and if we hadn't bought her to come here and be a pet with a job, she'd probably be a Connie-burger.
keep the Ellie-moo pics coming!
Lynda