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Yes bioactive soil is safe for her. Do a forum search, our member Jarich has instructions on how to set one up.
Most of us don't use sand mostly because of the risk of impaction. If you keep your beardie well hydrated it should help prevent impaction. There are other issues with sand though. Keeping it clean is real hard. No matter how hard you try they will knock their salad around in the sand and it will get burried. They will also poop in on the sand and there is really no way to know for certain that you've removed it all. Bacteria spreads fast. The other risk with sand is them inhaling sand dust or getting sand stuck under their eye lids.
Ya, sand acts like a dessicant, and so can actually help lead to the dehydration that causes an impaction. It does not sustain a nitrogen cycle either so bacteria just builds up in it.
With bioactive soil, they have the chance to burrow and create their own humid hide, thus conserving moisture like they do in the wild. It also sustains a good nitrogen cycle so actually breaks down the wastes naturally and controls bad bacterial growth.
I personally wouldn't, but no one here can tell you what to do, only guide you in the right direction. It's up to you what you choose to do with the advice. That being said, do not use any loose substrate until after one year of age, eighteen months to be safe. Eighteen months is considered adult, 12-18 is considered a sub-adult I believe. Good luck.