hello my friend
the little one has taken a big hit from stress, but nothing is lost yet. We will try to stabilize everything. Here's what I would do in your place to get her back on her feet:
1. Stop all manipulations
She is in survival mode, so we completely forget about LST or any other form of training for the moment. Leave her alone, don't even touch the branches. It needs all its energy to rebuild its roots after repotting.
2. Bring back the humidity (It’s urgent)
40% RH is far too dry for a plant under transplant stress.
Target 60-70% relative humidity for now.
If you don't have a humidifier, place a transparent dome (like a cut bottle with holes) on top to create a mini-greenhouse. This will help him not sweat too much while his roots are struggling.
3. Watering management
It’s the classic trap: don’t drown it to “compensate”.
The potting soil looks quite dry on the surface, which is good for oxygenation, but make sure the core of the root ball remains moist, not soggy.
Water gently around the stem, not directly on it, to encourage the roots to spread.
4. Light and nutrients
Lower the light intensity: If your LEDs are at full strength, turn them up or lower the dimmer. Too much light requires too much energy from a plant that cannot yet drink properly.
No fertilizer: Don't add anything yet (except maybe a root stimulator if you have it). The yellow leaves at the bottom are "sacrificed" by the plant to nourish the top, this is normal after such a shock.
The extra tip: Don't cut the yellow leaves right away. Even if it's ugly, the plant draws its last resources from it. Wait until they fall off on their own or are completely dry.
In 3-4 days with higher humidity, you should see the top recover. If the new foliage comes out nice and green, it’s a win! I hope I was able to help you, good luck see you soon.