Linking families in my Disney experience question

[Diamondintheruff]

We will be overlapping our dates with another family. We wanted to share the memory maker and I understand that means that we have to link in our disney experience. If we link and my friend is the manager of the memory maker does that mean she could change our fastpasses? How much power does linking our reservations give us? I'm not really worried as we've been friends for ages just more interested.