Okay thanks guys.
I used DFHack to check the map and I don't find any sedement. So I'm going to rely on wood (I have a wooded area so no problem there).
There is a magma area on my map not tooo far down actually... but it says "open space Magma 7/7" and it goes down down down down deep. Is that just like a huge hole over a magma bit somewhere down there?
I have never found magma before so I have no idea how to use it. What I have to do to use it even.
I managed to make the picks! The issue was I'd ordered iron picks. I changed it to copper picks since I had galena and tetrahedrite (one of those is copper... I think the latter...) And so now I have picks and the mandate is solved.
She didn't have a weird fetish, just wanted more miners I suppose.
But now I have no iron so I'll have to buy iron stuff from the caravans.
I guess I'll focus on my textiles and food industry for dwarfbucks.

So how do I utilize that magma then... That's next!