Q.What Is Happening To My Pink Witch
Why is the center turning brown and she is quickly losing color and dropping leaves….soil is dry, so I’m not sure what I’m doing wrong?

Certified GKH Gardening Expert
It looks like it remained wet for too long at some time recently. This will cause root suffocation and it can take awhile for it to show. They do need moisture down into the soil but never any standing water. Make sure water does not sit in the bottom container at all. If there is any extra, dump it out. You might even opt for a more shallow drop pan. You can try fungicides, but what has already browned might stay around.
Another thing that causes this will be direct sunlight. They prefer indirect light. I don't see this as much indoors as I do outdoors.
Outside of that, proper care should ensure that it remains healthy in the future. This article will help:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/aeonium/growing-aeonium-plants.htm