A Round Rock woman tried to stab her brother during an argument about her sticking her fingers in his burrito, an arrest affidavit said.

Cheryl Lenihan, 55, is charged with aggravated assault with a deadly weapon, a second-degree felony punishable by up to 20 years in prison.

Lenihan’s brother told police he was in the kitchen Wednesday at his home on Lasso Drive in Round Rock when Lenihan stuck her fingers in his burrito, the affidavit said. He said they "began arguing about the cleanliness of her fingers," according to the document.

It said that after the brother walked out the back door and then back into the kitchen, Lenihan grabbed a kitchen knife with an 8-inch blade from the counter and started swinging it back and forth at him.

The brother said he asked his sister, "What are you doing?," according to the affidavit. It said the victim told police she "then held the knife above her head and began stabbing it at him, comparing it to "Bates Motel," a TV show

The brother said he pushed her away and she fell to the floor and dropped the knife, the affidavit said. It said he then put the knife in a paper bag and hid it outside.

When police arrived, Lenihan, who "appeared extremely intoxicated," said nothing happened and that her brother had no reason to call police, the affidavit said.

Another brother who lives at the house told police he heard Lenihan arguing with their brother about her sticking her fingers in his burrito, according to the affidavit.

It said the other brother also told police he walked into the kitchen and saw Lenihan on the floor with a bleeding elbow that he helped treat.