Arroyo claims the pharmacist later told her she was just trying to vaccinate as many people in the community as possible to keep people safe.
With more kids now allowed to get the shot, Arroyo worries this could happen to another parent.
Robinhood said it believed no social security numbers, bank account numbers, or debit card numbers were exposed and that there has been no financial loss to any customer as a result of the incident, which took place on Nov.
The fee-free broker said the full names of a different group of about two million people were also exposed in the breach, while 310 people had more personal information, including names, birth, dates and zip codes, compromised.
The company also says it is committed to complying with all vaccination regulations.