Britney Spears slams sister Jamie Lynn Spears over book, music: 'Everything was always given to her'

Jamie Lynn, 30, has expressed support for her sister on social media, but Spears, 40, has jabbed her family multiple times, even name-dropping Jamie Lynn on a number of occasions.In a lengthy statement she shared on Twitter Thursday, Spears tore into Jamie Lynn as the star promotes her upcoming book, all while recounting a health scare  from the previous night.JAMIE LYNN SPEARS DESCRIBES ALLEGED INCIDENT WHERE SISTER BRITNEY 'GOT IN HER FACE' WITH HER DAUGHTERS PRESENTIn her message, Spears said she "got really sick last night" with a fever of 104 degrees. (Image Group LA/Disney Channel via Getty Images)The singer said that her 104-degree fever amounted to an emergency and railed against the "sarcasm" in the security guard's voice when he declined her request.The star said she then turned her attention to an interview that Jamie Lynn gave to promote her book.JAMIE LYNN SPEARS DENIES PLAYING A ROLE IN BRITNEY'S CONSERVATORSHIP: 'I TOOK NO STEPS TO BE A PART OF IT'"I watched it with a 104° fever lol and it was actually kind of nice having a fever so high cause I had to surrender to not caring," the singer wrote. Spears said her sister Jamie Lynn "never had to work for anything" and performed remixes of the pop star's song at someone else's suggestion. "I do remember asking my sister why she did that when she knew I was waiting to change my show and her only words were ‘Well, it wasn’t my idea'… Hope your book does well, Jamie Lynn !!!!"The star then said she'd be taking a hiatus from Instagram for a time, as the media and "this business has always been extremely hateful to me."BRITNEY SPEARS AND JAMIE LYNN SPEARS FEUD: EVERYTHING TO KNOW"I've given enough … MORE than enough.