Freedom
Free up the ol' schedule to give said writer some actual butt in chair time. Be creative. Offer to make a meal or do some yard work or something.

Encouragement
Rejections are like suffering repeated kidney punches. Simple validation via a note (how the writer's words have been important to you) is the gift that keeps giving because this is one present that won't get returned.

Shout Out
Post a review on Amazon or Goodreads for one of the author's books.

Natural Writer's Block Remedies
That'd be java and chocolate...preferably dark.

Create Space
When writer's block hits, sometimes the physical act of writing words on paper with a pen gets the juices flowing. Did you catch that? Journal. Pen. Yeah.

Piece of Quiet
Writers need to get away to a cozy place to write...even if that place is just a closet with a desk shoved into it. Candles are a good idea.