Solange's reason for going up against JayZ is hilarious... Read the deats here!

I find her reason absolutely crazy, irrational and certainly uncalled..

Solange Knowles reportedly lashed out at Jay Z

because he has failed to help boost her career. How career wrecking! What ever "boost" she intended having has gone down the drain..

The singer, physically attacked her brother-in-law in an elevator at the Met Gala after-party in New York City on Monday night (05.05.14) because the rapper has reneged on repeated promises to work with her in the studio. He never occurred to her that he might have had his hands full.. No it didn't. 

A source told the MailOnline: "Solange is so angry because Jay Z promised to give her more help with her career and when she brought it up again the night of the gala, he told her he just didn't have the time to.work with her in the studio. He hasn't kept his promise to help her.

"Jay keeps telling her to give him some time and he will sit down and write with her and then get her into the studio but he hasn't done it yet."

Prior to the drama, Beyoncé, 32, and Solange, 27, were seen dancing like its their very last on the dancefloor with supermodel Naomi Campbell, while JayZ, 44 - who has two-year- old daughter Blue Ivy with his spouse - stood back at one of the fireplace areas babysitting Ivy.

It is however said that JayZ wasn't the only one at the receiving end of Solange's wrath that night as she was reportedly seen yelling at fashion designer Rachel Roy earlier in the evening as well.

What ever was left of her carrier has officially been wreck.