Okay - lacy is the boss. When she is challanged, you back her up. Fuss at the other in a non approving tone. Do not make eye contact with lacy in the fuss ( ignore her..)... You dont want to encourage the fight but you told as the alpha wolf in the house there will be NOOOOOO decention in the ranks here by fussing at the other. But no approving of the fight by ignoring lacy. If lacy comes to you shortly after wards, you pet her and tell her in approving voice she is the boss...