Leanne Loughrey had been stewing for years about her marriage breakdown when she approached an old high school friend with a sinister proposal.

"Would you do a job for me? I'd pay ya," Loughrey said in April 2016. "Can you get rid of that bitch for me that's with me husband?"

Loughrey, 48, had parted ways with her estranged husband Stephen in April 2013 after more than 20 years of marriage. Within five months, he began a relationship with another woman and moved in with her, and Loughrey believed the woman was the reason her marriage was over.

Leanne (left) and Tiffany Loughrey were sentenced at the NSW District Court on Monday.

In conversations with her old friend, who lived on the same street in the Hunter region suburb of Hunterview, Loughrey offered to hand over the address of her perceived rival and point out what she looked like.