Raising kids is hard as a single parent... if you try combine that with following your dream... cudos!
However I believe she might have some misconceptions on the job she's trying to pursue...
Specifically when she's mentioning snorkeling, clear water, fauna..etc...
If she would be a mechanic... a greaze girl... someone who likes to get her hands dirty... owns her own welding equipment... (and I do know a girl or 2 like that)... she might have a chance... Isn't being a sat diver first about your technical skills and in a distant second your diving?