BLANCHARD, Okla. –  The teenage mother who shot and killed an intruder on New Year's Eve after asking a 911 dispatcher for permission told Fox News on Friday that she still somewhat in shock over the ordeal.

"None of it seems real," Sarah McKinley, 18, told Fox News' Shepard Smith.

McKinley, a recently widowed Oklahoma woman who was home alone with her 3-month-old son at the time, said she focused on every little detail and noise while she was on the phone with the 911 dispatcher as the suspect broke into her home. "It helped me to stay calm," she said.

Authorities don't plan to file charges against McKinley for killing the intruder, Justin Shane Martin, but Martin's alleged accomplice has been arrested and charged with first-degree murder.

A 911 tape released to Oklahoma City media outlets Wednesday details how McKinley asked the dispatcher for permission to shoot the intruder. 

"I've got two guns in my hand. Is it OK to shoot him if he comes in this door?" McKinley asked the dispatcher.

She had grabbed a 12-gage shotgun but wasn't sure if it was going function since it hadn't been used in over two years, so she grabbed a pistol for assurance, she told Fox News.

"Well, you have to do whatever you can do to protect yourself," the dispatcher is heard telling McKinley. "I can't tell you that you can do that, but you have to do what you have to do to protect your baby."