The 29-year-old told E Dugdale Sons & Grandson that the employee had come too close to her car and could have caused her to crash.
The nasty note comes while Muller-Aragon takes a strong stance against the district's new transgender policies for students.
Muller-Aragon opposed the district-wide proposal earlier this year that would allow transgender students to use locker rooms and bathrooms for the gender they identify with.
It would also allow for transgender students to be called by the names and pronouns they identify with.
Muller-Aragon feared students would feel uncomfortable if they had to change or use the restroom alongside a transgender student."I once went into a restroom alone, there was a transgender person inside, and they didn't let me come out," Muller-Aragon said in March.
The board never voted on the policy because Superintendent Raquel Reedy put the policy into place on her own.
Muller-Aragon has a problem with that, and is now trying to work with a lawyer to see if Reedy violated protocols."We're the ones who create policy, and the superintendent is supposed to implement the policy," Muller-Aragon said.Despite Muller-Aragon's efforts, board members like Steven Michael Quezada say no one should threaten Muller-Aragon or her family.Quezada strongly supports the transgender policies and butted heads with Muller-Aragon when the board originally debated the proposal."We all have the freedom to be who we want to be, say what we want, love who we want, and if I'm going to fight for that then I'm going to fight for Peggy to say what she wants without being threatened," Quezada said.In the meantime, Muller-Aragon says she's not thinking too much about the note, but also says she will not be intimidated by the person who left it."They're trying to silence me on this and I will not let that happen," Muller-Aragon said."It's frightening of course for my family, but it gives me more resolve. So, real networking is about re-invigorating your relationships and engaging new connections and new networks.