Two western Oklahoma families are grieving after a deadly car crash killed two children and a mother on Monday.Oklahoma Highway Patrol is now investigating what led up to the tragedy in rural Oklahoma.On the side of County Road 2310 sits a small memorial, grieving the loss of two children and a loving mother. Tire marks burned into the rural road paint a picture of Monday’s tragedy."From when we arrived, we knew it was going to be a severe incident," said Lt. Dylan Abner, Clinton Fire Department.OHP said a 24-year-old driver was heading north over a bridge outside Clinton in Custer County when she lost control with her two little children in the back, 2 and 4 years old. She struck another car head-on."When we arrived both cars were in the ditch area," Abner said.Inside the other car was 45-year-old Tina Smith and her 16-year-old daughter Alexis. Troopers said they died on the scene.In a statement, Tina’s ex-husband told KOCO 5 that she was a "rockstar mother" and "Tina was a mother of 4. She cherished her kids. She loved going shopping with her daughter, loved going to see her boy play live in his rock band. She was a rock star when it came to being a mother."He went on to write a tribute on Facebook that said, "Her kids was her world. They could do no wrong. Tina was my first love and has and will always be part of me. My daughter wasn't mine by blood, but I raised her since she was born. She loved her brothers and hanging out with friends."The driver of the other car was pinned under the car for 45 minutes."She had a substantial injury to her lower body. We had to cut away the vehicle to get her out," Abner said.The young mom was life-flighted to OU in good condition. Her 2-year-old daughter was taken to Children’s Hospital, but first responders said the 4-year-old boy didn’t make it.Now, OHP is investigating what led up to the crash. Troopers said speeding could be a factor."A lot of times in the rural areas, there are hills where you don’t see them as much on an interstate system. It’s very easy to lose control on a roadway like that," said Trooper Eric Foster, OHP.Two of the people who died were not wearing seatbelts.