"What if those scissors would have been pointed up and I would have hurt my mom? Trying to make something good, I would have hurt my mom," Nava told CBS Dallas/Fort Worth.
Nava posted a video of the cake and its unexpected ingredient on Facebook.
She said the store gave her a replacement cake, which she then discovered contained what appeared to be a human hair.
A manager for the El Rancho Market's corporate office contacted the family to apologize. Nava said she doesn't want any compensation from the company, she only wants the store to make sure its employees are properly trained.
"I think it's enough. Scissors to me, that could have been an eye or something," she said.
Marcos Rubalcava, a spokesperson for the El Rancho chain, said the incident is under investigation.
"We are in the process of investigating this incident," Rubalcava told the Arlington Voice newspaper. "No matter what the situation, our policy is if something was done incorrectly, we want to rectify the situation with the customer."
