Join Date: Aug 2009
Location: New South Wales, Australia
It's understandable that she's easier to catch with less horses in a small space. She's maybe bored, and doesn't feel that she is part of a "herd" so much. However being tricky to catch is not a good reason to keep her apart from others. Many horses are hard to catch and there are heaps of things you can try.
I'd start by going out to see her without catching her, even in the small paddock, just walk up, feed a carrot or something and then leave. Don't just catch her when she is going to be stabled, or worked, take her out and feed then put her back, or just take her out to graze.
A technique I have used is that when the horse walks away I walk after them, when they stop I stop and even take a step back, releasing the all the pressure. Then I walk calmly towards them on an indirect angle. When the horse moves I walk towards them until they stop, then I stop. I keep going until I get closer and closer.