Do you live in an igloo

? For the water to be 60 it must be realy cold in your house.
My turtles sometimes go in a "sleepy mood" and sometimes they dont want to eat for a day or two, which is normal. But if you start noticeing (crooked swimming, open mouth breathing, sneezing, coughing) then you should worry, but for now keep an eye out and try getting a better heater, you might also want to set the temp at 80 degrees for a couple of days, then slowly drop it down to 75 degrees.
The fact that quinn is eating is very, very good BTW.