Don't worry - if you've had oversupply, your supply is generally very responsive to stimulation, and will increase as needed if you just feed on demand. No need for fenugreek at this point.
If your baby is sleeping soundly and not asking to nurse, I would conclude that she is not hungry, not that your supply is low!?
You do know that after a couple of months, most women notice that they do not feel as full or feel letdowns as strongly, but this does NOT mean that the milk is not there ... right? It's just your body getting used to nursing and normalizing the process a bit. So maybe that's all that's happening here. If baby's diaper output is good and they're happy and growing, all is well.