so i have this customer that ive been mowing her yard since i was 12 (im 17 now) and i charge her $120/month to do regular cuts and fertilize it and trim the hedges. she is in the army and she went overseas. the problem is she hasnt paid me in 2 months but since she has been such a good customer i havent stopped mowing it yet. im not sure what to do, should i keep mowing it and give her a HUGE bill when she gets back or should i just stop mowing it? i really like this lady but i cant work for free!