Gastro?

Hi, my DD2 (almost 4) started vomiting on friday night. She was sick (or dry wretching) every 20 mins from 6.30pm to midnight. Then she was fine, although she had a temp all day yesterday and was obviously unwell, but just no more vomiting.
then this morn at 4.30am (sunday morn) she is vomiting again. Twice so far. And still has temp. There is no dihorrea (sp) and Im just wondering if this is normal for gastro. With my other DD she only ever had vomiting that would come and go for a few days but never so often as DD2 and no temps ever. So just wanted to know if anyone else had experienced this or if maybe she has something else going on as well.
Oh and her breath stinks, not of spew, but of that chemically smell they get with tonsilitis. Her tonsils looked ok yesterday though.THanks xo