I don't see anything wrong. Looks fine to me.
As new growers we tend to over mother our plants and expect to see changes on a daily basis or we get impatient.
Less is more when it comes to caring for the plants most of the time. As long as your temps/humidity/pH are all good, after a water/feed you can leave her for a good few days without peeking and worrying about anything.
Most colour changes to leaves early on will happen due to nutrient lockout. As long as your ph is around 6, you'll be fine.