Sorry about your friend, that was sad to hear. Same thing happened to one of my best friends growing up in JW. She got pregnant and married the worldly man , got a divorce , she had custody of the baby. She went to get the money for child support and the man shot her, he said it was self defense . He was 6'1 , police officer and she was 5'2 tiny, but she took his gun and shot herself. Very unlikely story and an investigation was started, nothing came out of it, but the JW's showed no sympathy for her or her family. If only she would have done right , she would not be dead. Bullcrap.
Mourn your friend in anyway you need too. Dont put it off, I agree flowers or a card would be nice, even if you think the family wont care, they just might. Anyway , it is for her memory more than anything, but just letting them know you care will say alot .