I think you've got a little light burn, and the stunting/small leaf/bonsai effect could quite likely be caused by your mother being root bound, even though the pot may look good size for that size of plant, she has been in there for a long time. It may be time to retire her! Do you have female clones available to replace her?

BTW I love your wire training, just like real bonsai! I'm starting to do that too.