Family friend Millie Volckman, who had been best friends with Mrs Dowling since they were 14, said she wanted to do something to help in the wake of Mr Dowling's death.
She had set up a Givealittle page, which had raised $246,000 by last Thursday.
"We wanted to help out financially, so she doesn't have to worry about the farm and finances for a few months and can just spend this time with her children, keeping memories alive and under standing this new way of living without her best mate Gav.