Had a coworker today come up to me and go "Do you want to do me the biggest favor?!!"

I respond "What do I get out of it?"

She says some random bullshit

then she asks "Do you wanna go to the bank for me and get change for the store?"

I simply tell her no I can't and I have a lot of my own work to do. She then says "fine I'll just get someone else then." I simply reply ok and go back to my work. She then gets pissy at me the rest of the day and barely speaks to me when she's usually all happy and laughing around me.

Breaking the chains I guess. Note she's never asked me to do anything else for her before. But we often banter back and forth at work. What gives? Guess she didn't like how her dog didn't roll over for her? Now she's going to go all silent treatment on me until she gets over it which will be about 2 days tops?