AsNoriuanswered grow question 3 years ago It needs perlite, your small plant roots could be lacking air already, that soil looks very fine and heavy ...
It's not too late to transplant.
If you still want to use your soil, just buy perlite separate and mix 50/50 ratio with soil.
Think it's the problem
Plus I see that maybe she can't get air too, stagnant ?? Looks like she is very deep in the pot.
Good luck !