Did you have a strong or weak solution of miracle grow? I usually wait a few days after transplanting before I fertilize. So a strong solution may have caused stress in a plant that was already in a stressful situation. Also, when you watered did you completely soak the soil in the pot or just the top couple of inches. It is important to completely soak the soil when transplanting and to make sure that your pot is draining properly. One more thing to check — is the plant close to an air vent where the cold air of the air conditioning hits it? If so, this is a problem for the spindle palm. They do not like to be cold.

All is not lost. Make sure the root ball is moist and draining well. Make sure it can get a fair amount of light — it is a full sun plant and will need a very sunny exposure inside the house. Move it out of the air paths in the house. If it had to much fertilizer, it will take time for it to recover. The new stem should feel supple and not dried out. It may take a while for this stem to open so be patient.