Amanda Pollard, 28, is charged with tampering with food, a class 2 felony, and criminal trespass, a misdemeanor.
Police said Pollard was living with the victim until December 1, when he called police to have her evicted. She took her possessions and left the home.
A few days later, the victim asked a friend to check his house while he was at work because he was afraid Pollard may do something.
The friend went to the house and found Pollard inside. He told police he saw her put rat poison in both a coffee container and cereal container. He said she also cut a cord on his electric blanket and urinate in a mouthwash bottle.
Pollard remains in the Tazewell County Jail on $50,000 bond. Her next court appearance is scheduled for December 26.
Source: NBC News