Dependent 19 year old with earned income of around 3K and dividend income of $879. Required to file own return?

Hello,

 

My teen daughter worked a part time job over the summer and was a full time student with earned income of around 3K and dividend income of $879.  We're claiming her as a dependent on our return.  Is she required to file a tax return?  If not, do we have to include her income on our return? My understanding is dependents with a gross income over $1300 must file, but I'm seeing conflicting info here.   Thanks in advance.