Hard one, burnt tips, signs of deficiency of zinc, i think it might be a sign of too much nutrients, sure she has red stems, but that isn't always from phosphorous deficiencies and phosphorous deficiencies start from the bottom going upwards, micronutrient deficiencies start upwards and move down.
Also i have some experience at giving too much bloom and before you know it.... bam full purple creeping in.
Its just my 2 cents, but stop giving nutes, let her recover a bit, and watch what happens, just give plain water and see if the damages progress or if she stops getting damaged, if the damage becomes even bigger you might want to go with another option, but i think its possible that the progress of symptoms stop after you water her well watered.
It could also be ph issues, overwatering, underwatering, grow light height... but if everything is perfect it might just be too much nutes, autos require less nutes than photodependent strains.
Hope i helped. She can lockout calcium magnesium zinc and iron from too much potassium or phosphorous. You could even have a excess of potassium and a deficiency of potassium. If you wanna share more ideas, just take a couple more pictures close up to the symptoms (please turn off grow lights for a moment and use your phone's flash at a proper distance as to not create a glare in the symptom area), and post em to the diary, then send a dm and i will take a look and ask for whatever is needed to get to a conclusion, then you can check out if it makes sense or not, but with the provided pictures and data i could only come up to this conclusion.
Stay lit growmie.