Good for you....training to be a CNA! It's hard work, but you might find that you enjoy it so much you'll continue on with further training. Most hospitals, once you are employed, offer generous amounts of funding because there is such a huge shortage of nurses around the world, and especially in the US.
Usually, they will pay a years worth of tuition for each year that you promise to work for them AFTER getting that degree....and then you can go anywhere in the world you want!
You're a thoughtful girl to be making cards for those kids, and I'm sure you'll get a ton of self-satisfaction from finishing that project.
Cryptograms will always be here when you have time to play.
Best of luck to you,