In my mind, a WIP kit is a hard sell. First you may not have all the instructions or the pattern. It is not always easy to figure out what the kit will make if it is just a bunch of squares and strips cut out and partially sewn together. Also not all quilters have the same skill set or as precise in piecing as others. A more precise, experienced quilter may not want to rip and resew units that don't have the proper seam allowance and if the home made kit doesn't have good instructions a less experienced quilter will be intimidated or frustrated by it. Also you must take into consideration the amount of fabric in the kit. Will it make a bed size quilt, a lap quilt, a wall hanging? What kind/quality of fabric is in these WIPS? All these things will be dependent on setting a price. For a bed size quilt maybe $20 or $30. That is assuming there is the equivalent of 7 yards of LQS quality fabric AND a complete pattern/instructions in it. Smaller things go for smaller prices.
Did Jeanette belong to a guild or quilt group of some sort? If so, perhaps the family may seek them out for a sewing buddy of Jeanette's that knows her style and may be willing to take the project on.
The family would probably have much better luck selling her stash, the uncut yardage then WIPs. But even then, people do not want to pay a fair price for estate sale fabric. Most think $5 per yard is way too high even though most LQS fabric sells for twice that now. I am sorry for your friends loss.