At home once more, (13)
The word "home" connotes comfort, security, ease, even love. The ponies already know how to be at home in nature, and their welcoming of the visitors suggests that humans may find their true home in nature, too.
For she has walked over to meAnd nuzzled my left hand. (16-17)
This just gets better and better. The speaker's decision to step out of the manmade world and into the world of nature is paying off big-time. The mysterious beauties of nature are unfolding not at a distance but in an up-close and personal way. Nature herself (in the form of the pony) seems to reach out with a gentle touch, drawing the human into a closer relationship.