I have also read about using ball points with batiks. I think the theory was because batik fabric is a denser weave so the ball point needle will ease the threads apart and the needle will go between them rather than a sharp needle which could potentially cut the threads. Personally, I've quilted with batik fabric on top and for the backing and just used a regular needle. I just change the size of the needle to match the thread chosen. Every machine is different! I would do as Peckish suggested & ask your friend to bring fabric scraps from the top and backing and just do some research on your own when she gets there.