Actually, I think 5 more would be better - give her an even 8 so there isn't an 'odd one out' so to speak.The best solution is really more chickens. That way Bernie can share the love and not wear out one lady. Just like a rooster would. 4 more hens would be just right.
OR, if she can get a roo, 5 pullets and a cockerel. I think she has said that 8-12 would be a good number for the Palace, no?