At 1.30pm the page has raised $120 from nine donors.
"All I have ever wanted is to feel connected and know my family. I knew there must of been some out there and I've held that hope for a lifetime," Ms Sabine wrote on her fundraising page.
She lost a daughter previously. "I have had to deal with these events on my own and I yearn to be surrounded by family."
It was only after Leigh Ann Sabine died of brain cancer this month that the body of her husband was found in the garden of her council flat in Pontypridd, South Wales.
Police believe his wife killed him and then kept his body hidden in her flat for 18 years.
The couple had moved to New Zealand with their children but later abandoned them when they were aged between 2 and 11.
The siblings only heard of their parents' fate again last week when police contacted them in New Zealand.
Leigh Ann's son Steve Sabine was "overwhelmed" by the historic murder allegation but told British media: "If anyone was going to do it, she was going to do it."