Sarah Nicole Henderson, 29 (pictured) of Mabank, Texas, has been charged with two counts of capital murder after fatally shooting her two young daughters Kenlie five, and KayLee Danielle, seven

A north Texas woman who has been charged with shooting and killing her two daughters as they slept planned on murdering the young pair for weeks, police say.

Sarah Nicole Henderson, 29, of Mabank, has been charged with two counts of capital murder after fatally shooting Kenlie, five, and KayLee Danielle, seven.

Her husband, Jacob, who is stepfather to the girls, told deputies that she told him: 'Babe, I just shot the kids' before he found them dead in the living room.

Earlier, around 11.30pm on Wednesday, Jacob called 911 claiming that his wife was suicidal.

When Henderson County deputies got to the scene, the couple said everything everything was fine.

'No one was in any danger. No one was suicidal, no signs of violence, no signs of anything,' Henderson County Sheriff Botie Hillhouse told WFAA.

Three hours later, early Thursday, Jacob called 911 again - this time to report the girls' murders.

'The only thing she told us was that she had smoked some marijuana early in the evening. She was very blunt. We just don't have any answers as to why,' said Sheriff Hillhouse.

Her bond was set Friday at $2million, and she was being held at the Henderson County Jail on suicide watch.

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Deputies say they received a call around 11.30pm on Wednesday from her husband, Jacob, who is stepfather to the girls (KayLee Danielle, left, and Kenlie, right). He claimed she was suicidal but when deputies arrived at the house, the couple said they didn't need any help

Three hours later, deputies received another call from Jacob saying Sarah walked into the living room where the girls were sleeping and shot them in the head (Pictured, Kenlie, left, and KayLee Danielle, right)

Hillhouse said Sarah confessed when talking to investigators and said she had been planning to kill the girls and her husband for several weeks.

She tried to kill her husband too, but the gun malfunctioned, authorities said.

Jacob had initially called 911 about 11.30pm on Wednesday to ask for medical help for his wife. According to a recording of that call provided by the sheriff's office, he tells operators that she won't listen to him and that she is 'freaking out like someone is out to get her'.

He calls back to cancel the call a few minutes later saying that Sarah told him she's fine now and is acting normally. The call was coded as a potential suicide when reported to the sheriff's office. Deputies responded to the house about 11.45pm, when the couple told deputies they were OK and didn't need help.

Around 11.30pm on Wednesday, Jacob, pictured with his wife, called 911 claiming that his wife was suicidal

Sarah confessed when talking to investigators that she had been planning to kill the girls (Kenlie, left, and KayLee Danielle, right) and her husband for several weeks. She tried to kill her husband too, but the gun malfunctioned, authorities said

Jacob called 911 again about 2.24am on Thursday to report that his wife had shot the girls. He can be heard sobbing and asking why she had done it in the recording released by the sheriff's office.

'She was asleep when I went to sleep last night. I woke up and she came in there said: "Babe, I just shot the kids". And I didn't want to believe it. I went in there and they were dead,' Jacob tells the 911 dispatcher.

He said the girls were asleep in the living room, and that they had both been shot in the head.

Sarah can be heard in the background asking her husband to kill her or shoot her, saying people are after her and that they're coming. At one point in the recording she yells: 'God forgive me' and 'What did I do, Lord? What did I do?'

Sarah can be heard in the background of the 911 calls yelling: 'God forgive me' and 'What did I do, Lord? What did I do?' (Pictured, crime scene of the Henderson home where the girls were killed)

Sarah's bond was set Friday at $2 million, and she was being held at the Henderson County Jail on suicide watch (Pictured, the Henderson home where the girls were killed)

Hillhouse said the girls' biological father has been notified. He added that Sarah has an older son who lives with his father and who was not in the house at the time of the shooting.

In 2010, Child Protective Services was called to investigate Sarah, but the information is confidential.

A GoFundMe account has been set up to help cover the girls' funeral expenses. So far, $5,530 has been raised out of a $7,000 goal.