You don't use antibiotics unless there's an infection. The blue phase is when her eyes glaze over before she sheds, usually the whole process takes about two weeks.
40% to 50% is too low, you need to be over 50% and under 65% normally. I don't know what you have for a set uup so I really can't give you much advice but if it's a aquarium style try insulating three walls with cardboard for heat retention and cover the lid 2/3 of the way for humidity. You can use a Plexy glass piece over the screen or doubled tin foil...also your heat source will play a big roll in humidity.. Another words a heat lamp and such will dry a tank right out.
Other than that she will heal just keep your husbandry correct, humidity is important for ball pythons.
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