Majestic It would amazing if ponies could feel the dust as she flies majestically past them, but I think it would also hurt if the dust would land in their eyes. lol."Grinding precious stones into dust", now that is severely cool and jeez shes strong. Under that beauty, she is packin.
Lol, its fine, I don't want you to change the idea of your oc. Its great. I just thought that's what would happen if the dust gets into the ponies eyes. lol. Maybe I was exaggerating, but maybe the dust can be like snowflakes. You know, like they would fall on the ponies and feel like this trickle of soft dust landing on them. Not stinging, but more like warm feeling as if your oc is giving the ponies of equestria good luck each time you pass over them Yeah, okay that whol stinging in the eyes may stay in my head and does sound true, but just think of it like gentle snow flakes. LOL, imagine if people/ponies got stung by snow as well. "Everyone inside, this darn snow is burning our eyes!!" XD
For the strength, I feel like you should just have your oc be that strong and not have to use any tools. I mean look at Maud Pie, she DESTROYED that boulder and she was an earth pony. Your OC may not be an earth pony but she sure can be the strongest kind right? Plus, more power to her right LOL, wouldn't it be funny if your oc went to the gala and somepony needed something lifted or I don't know broken, you just go through the crowed looking all glamorous saying " I got this, you better stand back though" and you just wreck or lift the object as if it was nothing. All of the other ponies would have their jaws on the floor XD. So I feel like you shouldn't use tools and its all her. She beautiful, her dust gives the ponies like a sincere feeling of luck and astonishment, and freakin strong. What stallion wouldn't want to be her. LOL. But yeah, I hope I didn't offend or make you have to change any of your ideas. There all great, just felt like I needed to say some things and maybe poke a few fun ideas into them.