I agree with everyone else.....more time so the plant will mature.
The pup is not hurting anything while it matures in the container connected to the main plant.
I let mine get pretty large and then use a sharp knife to sever the plant from the parent.
I just sever it, I do not remove it from the pot. There are now two plants growing separately in the same pot still developing their root systems.
I let the plant mature even further before I remove it from the container with all the roots now mature.
The pup is removed as a plug of soil and roots
You will then backfill the void left from the pup with new soil and the process starts over.
Your new pup/plant now is established and you can repot in another container with absolute minimum disturbance of the root ball guaranteeing a successful pup removal.
Click on the photos to see more possible separation ideas which could be helpful.
Pup separation of a container plant
by
Hostafarian, on Flickr
Container pup removal
by
Hostafarian,
on Flickr