ok, so not likely a molt causing any of the stated problems.
algae will become a problem with sunlight, so if the water is in a sunny spot, try to block it somehow. We had to put our water on some blocks (helps keep debris out), then propped a scrap piece of OSB up against a wall, in front of the water to shade it. in the summer our extra waterers are the plastic bell types and they will still get a bit slimy, a bit green, because theavailable light and temps are greater in the summertime. So, every few days we scrub them and do a light bleach soak then rinse. Maybe you live in a sunnier/warmer climate, so the problem is more of a year round issue. Pretty sure Flagstaff is sunny!
Also, I’m not sure how low Flagstaff gets, but if that is frostbite on her comb, it does not look very bad. In my experience, the grey area will look fine after healing, like nothing happened. Black areas will not regenerate. If the tips turn black, they will basically dry up, fall of and will heal more rounded. Don’t doctor injured skin with any kind of rubbing-it will do more damage than good.
you can add your general location to your profile, this helps