SAN DIEGO -- A Mountain View woman was critically injured and her 2-year-old son was hurt after they were hit by a speeding car Tuesday afternoon.

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Investigators said Wendy Manzano, 22, was driving a Ford Mustang westbound on Logan Avenue at a high rate of speed at about 4 p.m. She told police her brakes failed. When Manzanocouldn't stop the car, she turned into the parking lot of an apartment complex, police said.

Authorities said Deysi Araux, 21, was walking in the parking lot with her 2-year-old son, Steven. Witnesses said Araux saw the car coming and tried to throw the toddler out of the way.

Both were struck by the car, and Araux ended up on the Mustang's hood, police said. The Mustang then hit two cars in the parking lot, and Araux was thrown into the vehicles. The car broke through a fence and eventually came to rest after hitting a house.

Police said Araux suffered massive head injuries.

Araux's family members told NBC 7/39 on Tuesday night that they would not take her off life support until they get a second opinion from another doctor. She is believed to be brain dead, they said.

Her son was taken to Children's Hospital suffering from internal bleeding. He was in surgery Tuesday night, but family members said he is expected to survive.

Investigators said Manzano was not hurt. Police said they are checking to see if her brakes actually failed. She could face criminal charges, authorities said.