DALLAS -- The family of a missing teenage girl is criticizing the Dallas Police Department's handling of her case.

The department says the most important thing right now is to find 18-year-old Alejandra Gonzalez.

'I am frustrated, because I thought my daughter with special needs was being taken care of at the school and she just walked off,' said the girl's mother, Ofelia Melendez.

Gonzalez was last seen at Sunset High School on Jefferson Boulevard around 1:30 p.m. Wednesday. Police believe she left school unsupervised and are calling her a 'critically missing person.'

Alejandra's mother said her daughter has the mental capacity of a 6- or 7-year-old and that she's been trying to convince DPD to do more to help find her daughter.

'The detective told me she is 18 years old and looks normal, so he couldn't do anything,' Ofelia Melendez said.

Dallas police say they initially treated this as a runaway case, because Alejandra has done this before and they were told by her family she had the mental capacity of a 14- or 15-year-old girl.

Police say it wasn't until last night they learned more about Alejandra when the family provided documents on her mental capacity and decided to issue a critical missing report.

Gonzalez is 5'4' and weighs 140 pounds. She has brown eyes and black hair. Police say she was last seen wearing a blue shirt, blue striped basketball shorts and navy blue Nike tennis shoes.

She may have been spotted near the West End DART station, police say. Her mother has spent hours searching there on her own.

'I feel abandoned,' the girl's mother said. 'Words can't describe how I am feeling.'

If you have any information on her whereabouts, you are asked to call 911 or Dallas police at (214) 671-4268.

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