Oh good heavens, don't even start to think of LST at the moment.... light should be about 18-24" ... if you think she's getting too "leggy" then you can lower the light somewhat but don't go closer than 11-12" ... And just water AROUND the seedling, not right next to the stem... and not too much, either... let the soil dry out between waterings or you'll drown her.
Good luck!