My mom used to have a leo, and the same thing happened.. unfortunately, the fact that the leo had a massive intestinal impact wasn't acknowledged until too late, and he died. He was a weak hatchling from the start, so he couldn't hunt his crickets, so he resorted to staying in his cave all the time and actually eating the sand for weeks.
I would say the only thing you CAN do is use the mineral oil and try this... I know you said she hates the water, but it seems like it would help alot right now. Fill a container with about an inch or so of lukewarm water and hold her in there if you have to, with her head above the water, and I'm thinking that maybe making sure her feet touch the bottom would make her a little more comfortable, and if not, she'll get used to it eventually. Let her sit in there for a few minutes (I don't remember the exact amount of time you should do this, because it's been a while since I did it, but try about 10 minutes), then take her out, dry her off, and massage her belly with your fingers for a little while. This should help to loosen up her tract and may help her pass the sand.
Good luck, and keep us posted!!
P.S. I'm going to add a warning against calci-sand in my caresheet, since apprently this is happening alot with calci-sand.