Measure your run off. She looks like a brand new baby. If so, there really isn’t any reason to amend her living quarters besides a little Mycorrhizae if you have it, to go along with distilled water or pH adjusted RO water (tap water can easily kill seedlings). If run off is in range and you’re only watering, it could be genetics. I know you said she had company but if they are the same strain from seed, they could have any number of traits from either parent strain lineage so don’t expect carbon copy plants. Of course if they were clones they would have the exact same phenotype as their mother. If they are 2 completely different strains, you really shouldn’t expect much similarity at all. I did not research either strain before this comment but if I were you, that would be a point of focus. Can also check out growdiariesdotcom to see if anyone has run into similar issues and if so, you can pm the grower and confer.
I wouldn’t flush personally if that’s more of what you’re asking. I would plant 2 new seeds and take the stronger of the 2 to replace her before I went that route. She doesn’t need much water at all at this stage and you risk doing her more harm by overwatering which will slow her growth. Best of luck mate ðŸ™ðŸ»
