Hello, the pain of a kidney stone depends on the place where it is situated. We call it as referred pain. If the stone is higher up in kidneys it can cause pain in upper abdomen. Similarly if stone is stuck in lower ureters or nearby then pain comes in lower abdomen as you said rightly. So pain is in upper abdomen probably because stone is in kidney and causing pain. Regarding vomiting, when kidney tries to push the stone downwards it causes typical pain called as colic. Here we would call it as renal colic. In most of the colic pains, vomiting is commonly seen as there is spasm of muscular structures of body trying to reduce the causative factor of vomiting. Hence the vomiting. I hope she must have been started on the required treatment by the treating doctors and I have helped you answering your query. Thank you