Daugther's Summer Income

HI, My daughter had a job in 2023 and made income of 9k.  She did not withhold any federal or state.  We live in MD.  I want to take her as my deduction, so my questions are:

 

Do I need to include her income in my 1040 if I take her as a dependent? 

She read somewhere that she didn't have to file a tax return since she didn't make enough, is this correct?

 

Thanks