If you get the job--just be ready to offer a modified program when the weeds get bad and she gets pressured by other members to do something about the weeds.
Have in mind a low toxicity, no odor product that you can spot spray in the fall when everyone is inside anyway. Spot spraying uses a hundred times less product. Triclopyr and carfentrazone both have favorable environmental and toxicity profiles. Weed-B-Gone is more toxic.