Ditto things mentioned above. Peanut butter or other nut butter is good, lots of points (average of 5 pp per 2 Tbsp) for little volume. And nuts in general. Easy to throw over salads, stir into yogurts, cereals, oatmeal, etc.
Full-fat dairy, more points for the same volume. I know with some of the Fage yogurts, non-plain, for example, it's literally double the points for a full-fat yogurt vs a 0%. Same amount of food though. If making oatmeal with water, use milk instead.
I think the suggested daily points plus target breakdown in the Getting Started book is really helpful too (page 60). The chart ranges between 29 points and 71 points daily. Tweaks can obviously be made if someone wants to eat more at certain points in the day, or if their value falls between two values on the chart. But it's a lot easier to figure out an x-point meal or snack than staring at that entire lump sum of points.
I still keep a version of my breakdown by my desk, and if I go under or over what I allot for a certain meal, I adjust another meal in the day accordingly.
Btw that's really nice of you to want to help.