I would have this checked out, vomitting is not necessarily a good thing, I am wondering if there could be a leak somewhere. They would probably do a shunt followup study where she'd have an MRI and they'd inject some radioactive dye into the valva and follow it down.

I have had this issue, but usually it's a headache with extreme pressure in my head, till I vomit, and then I am fine. I remember that sometimes this is what it was like when I was a kid before they found out that I had a tumor and hydro... so definitely get it checked out.