Drop in brought second person

Hi, I recently had a sitter for 30 minute drop ins for 4 days for my two cats. On day 3 she brought her daughter with her.

This was not discussed beforehand or mentioned at the M&G that she would bring other people. I was very put off by this and let her know didn't appreciate her bringing someone have not met to my house to meet my cats. She (essentially) told me to go f myself.

Am I in the wrong? Is this something I should be ok with?

I told her I would not review her, but based on her response I am tempted to warn other pet parents.

Am I being petty with this? I appreciate your input! Screenshot attached.