If that's the Walmart expert soil I think I've used it before but anyways.
I agree with Mick above. Throw a little food at her and ya should see a difference in a day cycle. Seedlings respond pretty quick.
I typically start a small feeding when they are at or near two weeks. If your not in a pumped up organic type medium ya have to start feeding as they need it. Seedlings have some reserves for life when they emerge but it's limited time. Without nutrient to grab they stall.