This is something you have to weigh up. Sometimes its nice to grow a runt through to finish, ive done it many a time, and with reduced expectations, because they are a runt, they can sometimes surprise you, but.......time, money, nutes, the room its taking up, to a percy grower, these are big things. If your growing for you, and you've got empty jars, cull it, be ruthless. If you have time, space and full jars, grow it on. it might surprise you.
And did you not FIM her? She'll take a few days to recover from that