Prayers headed out that your sis gets better fast
Using lots of fresh herbs can help ease the pain of giving up salt. Throw out her salt shakers! The body does need some sodium to operate, so while she should avoid any extra added salt, and highly processed foods, she doesn't have to be on a NO sodium diet

If she sticks to fresh unprocessed foods, she'll do great. I love the Mrs. Dash seasonings myself, you don't really miss the salt they are good