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 marina°µÍø½ûÇøchaneleon.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