They shouldn't die, I let some plants in another room get a serious CalMag deficiency because I didn't really want them. I disposed of all but one that I had a change of heart with and she bounced back amazing when I rectified the deficiency.
Photo tho and in veg, your yield with the Auto may be a bit lower but she is already fairly along. I wouldn't worry too much; treat her, and learn as you grow. I still make massive mistakes after all this time and learn every day.
Try and see where your EC and pH are tho, even if it's test strips/drops. Not the best but I used the drops for some time before moving to meters and I got by OK enough until I had the funds to blow.