You're doing great Stoney, looks to me like she's well on the road to recovery.
As an aside... You know sometimes even organic pre-mixes (like cactus mix) can be a little inconsistent in ph and nutritive value out of the bag, just because they are "manufactured" in such large quantities. I'm not suggesting this was your young lady's issue, but as seedlings need virtually no nutrients for the first few weeks, it's never a bad idea to flush and mix your soil fully before it ever sees a seed.
Maybe nothing to do with your situation, but a good opportunity to share a hard learned life lesson...
Hard learned, mostly 'cuz I'm a knucklehead.