I think you were less wrong, assuming you had your cart out of the way (I hate when people leave their carts in the middle of the aisle!)
However, I would have been annoyed with her as well; I'm going to guess she didn't say excuse me as I agree, like a pp said, that using words has gone out the window. I try and be very conscious of where my cart is when I'm in stores and try and keep it out of peoples way, but sometimes you just can't, or you can't anticipate where people are going to want to look. And sometimes you stop last minute to grab something without thinking, it happens to everyone at times I'm sure.
However, for those people that sigh or comment or run into me instead of saying anything, I typically tell them that "Excuse me usually works." I know it's not the best way to handle it, but why should I have to deal with other peoples rudeness?