Update week 2: transplanted her into coco and fed her with ph perfect nutrients. It seems that starting in soil and moving to coco may be ideal when you do not ph water. She never exhibited ph problems, unlike in my previous grows.
@Chilipadi, it is not foil since that can create hotspots. It is plastified aluminium which distributes the light more evenly (just got it from some nuts package). It gets light to the lower portion of the plant.