Add at the bottom that you are hoping to raise enough money for the Ketamine treatments.

I would start it off with your name - maybe something like this??

Vanessa had a normal life of a active teenager, until it was turned upside down when a rare chronic condition developed.
It is called Reflex Sympathetic Dystrophy (RSD), also known as Complex Regional Pain Syndrome. At age 17, now she is nearly unable to walk, frequently bed bound and in severe chronic pain.

But things may make a huge turn around with a treatment called Ketamine. Ketamine is an anesthetic, which has been being researched the past few years by neurologists and pain specialists who deal with RSD. It can actually reduce the pain by 80% (in the norm) but has given 100% relief as well!
and on from there

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I'm thinking for a brochure - you just need a few short but clear paragraphs that will catch their attention.

you don't want to overwhelm them with too much info -
hit the main points about RSD,
how the money raised will be used for treatment costs
and the most important - how the severe RSD pain affects your life.

you might be able to find a brochure template online somewhere to see how much room is available and test the spacing and arrangement.

I was able to find a tri-fold template and import it into Word to make a anniversary card - but it was 2 yrs ago, so I don't even remember where I found it and I have since lost it to a hard drive crash.
I'll look around today if I have time and see if I can find something like it.