Bad friend?

One of my friends made plans to go to the zoo with each of our kids, the zoo is a little whiles away but my car sucks so I asked another girl going since she lives right down the street if doesn’t mind if my daughter and I carpool. She was super nice and is excited. Now the friend that made the plans to go to the zoo, messaged me and asked if I was carpooling with the other girl which I told her yes. ( the friend that made the plans had told me she was bringing someone else so I figured I’d asked someone else for a ride so we’re not squished. ) mind SHE is the one who made the plans YESTERDAY. After asking if I was getting a ride from the other girl she was like why didn’t you ask me? I explained why, to which her response was oh well I think we’re gunna go early so why don’t you just go with her. What? Am I crazy to think she’s mad I asked someone else for a ride? Or am I just over analyzing?