The methods she uses are based on the way horses act with one another within a herd.
"It's helped so many children to experience the unique and beautiful years of our horses swimming at the beach," Ms Williams said.
"We have given hundreds of children tail rides across the river and in the ocean.
"It's brought so many people together and we have an ever expanding community of friends."
The float is used to transport horses around the region to help with Ms Williams' equine lessons.
She said the horses gave children self-confidence while having fun through horsey adventures, with humility and kindness.
A group of parents who have seen the benefits their children have received from the programme have set up a fundraising website.
The target is $4000 and they have until April 14 to raise that amount on the Pledge Me site .
Pledge Me works on an all or nothing basis, so they need to reach the target to receive any of the funds.
You can help by becoming a Hero for the Horses and making a pledge at
www.pledgeme.co.nz/projects/1877.