I would firstly be giving her a decent drink with plain water to make sure the substrate is properly moistened from top to bottom. The reddish/purple leaf stems are of no real concern, unless you are giving waaay too much potassium. Once the substrate is fully and evenly moist, start feeding again.
But without a diary, it is hard to give any more precise answers, or without more info. Otherwise, answers will be, at beast, guesses.