we went through "nonsense" vomiting with my now 17 month old between 8 months and about 12 months.  We always chalked it up to his asthma-  so we thought it was just how it was going to be.  Had labs done, levels were a little off-  so we upped his corteff-  vomiting stopped.  Had 2nd round of labs done, he wa getting too much corteff so doc insisted we go back to original dose.  Vomiting started again.  Then I realized we had been weaning him off of his "salt" around the same time the vomiting started.......... so we decided to increase his salt back to where it had been and the vomiting STOPPED!  BTW-  His renin levels were fine, his sodium was a little low from where it had been trending (was around 138, but typically was around 141) Maybe increase your daughter’s salt intake-  it seemed to be the solution for my Johnny (sorry he is a salt waster) .  Best wishes. Gwen