Don't punish her for it - first of all, she's really young and doesn't have complete control over her emotions or how she acts on them. Don't reward it, but don't punish it. Second of all, I can't imagine that you want her to associate vomiting with punishment - that could turn anyone into an emetophobe. Again, just don't reward the behaviour by giving in to what she wants.
<font size=\"4\"><font color=MAGENTA><font face=\"Times New Roman, Times, serif\">It can, and does, get better with time.</font></font></font>