am I overwatering or under watering - eviltoast

This is a baby crape myrtle. It is currently under grow lights until the sun comes to the patio then it is outside in the sun. One day I noticed the leaves are drooping a little bit and the sides are rolling inword down. I can’t figure out if I’m overwatering or under watering. Somebody please help me understand what I’m doing wrong and why it looks this way.