4 year old DDs attitude: Having trouble determining if its normal

KatieandMark06

DD has always been over dramatic and sensitive (well since about age 2, she was an angel as a baby)  Around the time she hit age 3 or 3.5 it got worse.  She even went through a phase where she would get angry and smack at me.  Thankfully I have broken her of that with time outs and firm talks.  She just snaps from sweet to out of control in a second literally.  Like today she throw a complete freak out tantrum because she couldn't click fast enough on a computer game.  If you have a 3.5 to 4.5 year old do they lose control of there emotions this easily? I am having a hard time determining if her lack of self control and her temper are something I should worry about or something normal? She is very smart, her preschool teachers say her education is at about a 2nd grade level, however even her preschool progress report shows lower marks in areas of self control.