A corn not shedding from October to January sounds a little strange to me. Especially considering your snake is two feet long, thats not an adult or anything. Whenmy snake was around the same size as yours it was shedding like every month and a half or something similar to that...
As long as your husbandry is on the money, and the snake looks and behaves normally then i wouldn't panic yet, it is strange though.
A lightening of colours sounds like you could be describing the 'Blue phase' of a shed. Your corn should next return to its normal colouration for a few days, then it should shed. All in all the process should take about 7-10 days ish.