Depending on how wet the cake is around the girl, she is too wet and her roots are not growing. 2 options. A Let her live and don't water her until you see her growing. Or plant another one and, if worse comes to worst, you will kill her. Anyway, you have about 14 days before she starts. Such a seed only needs to have about 5cm of moisture around it. But if you have experience, don't judge me