When a hamster gets to 17months we find that they do sleep quite a bit more than when they were younger. Even a hamster who had not been through what little Macy had would be sleeping more and be less active so perhaps that is pretty much normal anyway and with her recovering still I would not worry.
With such delicate surgey on a small animal I would not be surprised it there were some damage to some of the nerves supplying the bladder and perhaps even the bowel which may explain the looseness. If the bladder wall has adhesions it is probably less effecient and as long as she is passing urine hopefully it is just the effect of the op. Make sure she has plenty to drink and I have heard that a bit of cranberry juice in the water can soothe the bladder. Maybe you could ask the vet what they think.
It seems that maybe she has lost the strenghth of a normal hamster to squirt the urine back so that is probably why her tail is getting wet. I guess it is a bit like us ladies and our pelvic floor muscles. It is common for ladies to have bladder problems after a hysterectomy so I am sure hamsters are the same. Keep up the wipes so she does not get sore.
She sounds like a lovely hamster and you are a wonderful family to her.
!! I may discuss this with the vet again if she doesn't improve over time or ever appears to be in some sort of distress. I am so greatful for all you've shared with me!! 
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