A lot of snakes will "go blue" and then their skin will look clear again for a few days before they shed. I'm not sure what to tell you about her breathing, but if you are concerned about shedding, make sure the tank is a little humid (May help with the breathing for a Ball Python too) and if you want to, soak her in about an inch of slightly warm water for 10-20 minutes.

Good luck, keep us posted!