What Causes Vomiting And Continuous Sneezing After Getting Hit On Head?

My daughter hit her head at daycare today. They said she hit heads with another child (not quite sure how hard it was). They said there was no swelling or anything and no dialation of the eyes or vomitting. That was at around 4pm. I picked her up around 5:30pm. She said her head hurt and she was tired and wanted to go home. She rested on the couch while I made dinner. She ate around 4 bites of food and then wanted to rest on the couch some more. I let her do so. I gave her some childrens tylenol around 6:30pm. She said her head wasn t getting better at 7:30pm and asked to go to bed. I said yes and while getting ready for bed she vomitted. Shortly after that we were reading a bedtime story and she started to sneeze uncontrollably. A whole lot of clear snot was coming with it. She finally stopped after several minutes of sneezing and is now asleep. Should I be concerned?