Should my minor child file a federal return?

She earned a couple thousand dollars over the summer.  She is well below the filing requirement and although I withheld federal taxes, she's not getting a refund.  I'm not sure why not...?

 

In an event, my question is since she neither owes taxes nor is getting a refund, should she still file? The only benefit I can think of is so she gets "credit" for working.  I know you need 40 quarters of working to quality for social security benefits.  I'm sure she'll get that eventually so my question is more curiosity than anything else.