nope i just feed her like 2 days ago with a very very small feedingHard to tell for sure but it does look like the beginning of nute burn. Either that or the start of a magnesium defeciency, but that is unlikely. Seedlings don't need any nutes at all till the 3rd set of leaves.. Have you been feeding from the the start or no?
This would have been my next suggestion.looks like a ph imbalance. check that first. a dolo lime drench at 1 tbsp/gal will bring it up if needed.
This would have been my next suggestion.