Calcium oxalate crystals
are seen in renal stones
or without stones in crystalluria
She should drink lots of water along with alkalizers.
Cranberry juice also helps a lot.
Vomitings can be due to pregnancy
For pain she can take antispasmodic under doctor's guidance.
There is nothing to worry about.
If pain is severe and more of vomitings then you can go for IV fluids in the hospital.