Maybe it's just me, but as p#£@+d as I get on the occasion something like this has happened to me , I simply leave a card "sorry we missed you, called today between 9.30-10.00 but nobody was home,please contact to re arrange" and move on. Chances are now that your customer has told her mates and family that she missed her cc appointment and has had several calls and texts which could be perceived as pestering or a nuisance, unfortunately though they did wrong to you, it would easily come off negatively on you, and one bad review or telling X amount of people could hurt you more then a morning or days lost income.
I often wonder about the guys who take deposits , not sure how I feel about taking/asking for one, but on the occasion this happens I guess it pays off...