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"She just started yelling at the students for not having the test, and she made a student cry," said one student, who was not named because they feared retaliation.
Geiszinger is expected to be charged with child endangerment after she forcibly cut a student's hair in class.
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Video surfaced Wednesday showing the 52-year-old science teacher chasing students with scissors between desks while belting out the "Star Spangled Banner" at University Preparatory High School.
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Students told Action news on Thursday that Gieszinger once had a meltdown in her chemistry class because an exam went missing.
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"There were a lot of people mad at the principal for not taking action beforehand and not stopping her before she threw a tantrum," said a student.
RELATED: VIDEO: Visalia teacher arrested for forcibly cutting kid's hair in class while singing 'Star Spangled Banner'
A social media account shared another incident in the school bathroom - where a girl said Gieszinger asked her if she'd ever heard a teacher use the bathroom.
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While students said it was apparent that Gieszinger had some sort of mental instability, her husband denies his wife has ever showed this type of behavior.
Online records reveal that Gieszinger had her credentials suspended twice: once in 2007 and again in 2016.
Many parents also said they believe the administration handled everything correctly and that this arrest is an anomaly to an otherwise high-achieving school.