Hello Angela,
Not sure whether this is of any interest to you yet, but when I lived in Mayotte, I was writing in my blog on Intagram (I later switched to Russian, but there are still lots of posts in English marina_chaff ) and on my website marinaexpatchaneleon.com, which is entirely in English. There is information about life in Mayotte in general and what you need to have for your moving.
As for the job, I didn't have your problem as I speak fluent French but I know a girl who was in your situation... And she did find a job! I can put you in touch with her. To be honest, there are very few choices. I can only think of one - teaching English. It's very well paid in Mayotte and although the job is tough and tiring, it offers a good life-work balance. If you are interested, I can give you more information.
Hope it helps and best of luck,
Marina