I know I’m a fanboy, but I have been using apple maps since iOS 6 beta and it has been great for me. Maybe I just happened to be in parts of the world where it just worked better. Often when I would find an issue, I would check google, and google had the same issue.
I purchased a used iPhone SE 2 for my son from Amazon for $140. This phone had a brand new battery and the screen and back glass are flawless. I was very impressed.
However, if you love the iPhone SE 1, I think that the iPhone 13 mini would replace it well. You would keep the squared off aesthetic, but gain a lot of usable screen real estate. The latest iPhone SE phones are the same size as an iphone 6, and similar to the mini, but they have lower end features and the round aesthetic. The only deal breaker I see is that the SE phones have touch ID rather than Face ID. Not sure which she would prefer. (I would love to have both!)