A Houston woman carjacked at gunpoint last weekend turned what she'd lost - her cellphone - into a crime-fighting tool to track down her car.

Monica Terrones, 19, was carjacked early Sunday morning at a Houston apartment complex. The suspect held a gun to her head while demanding her keys and then fled the scene with her car, her purse and her cellphone.

"I turned back and my car was gone," Terrones said.

When Terrones realized the carjacker also had her cell phone, she realized she could use it to track him down.

"I might be tiny - I don't think I'm any taller than 5 feet 2 - but you still don't mess with me and my stuff," she said. "I will hunt you down."

Terrones began tracking the calls the suspect was making on her cellphone and began calling the people he was calling herself.

"I let him have my phone for a day. … He made calls," she said. "I was like, OK, went online and called everyone, everyone on it, even if they hung up on me."

One of those people called Terrones back and told her the gas station where her car could be found.

Terrones called police with the information and went with them to the gas station. She also rode with police on the brief chase that ensued as the suspects fled.

"I was speeding, running red lights," she said. "I wasn't going to stop. I had him. I wasn't going to let him get loose."

Police arrested two suspects - Quintin Devone Brown, 19, and an unidentified juvenile - after the car crashed into a pole. Brown, who allegedly posted pictures of him with the car on Instagram, was charged with aggravated robbery and his juvenile accomplice was charged with evading arrest, according to local ABC affiliate KTRK.

"I'm going to testify against them," said Terrones, whose car was totaled in the crash. "I'm going to do everything I can to put them in prison."