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I agree, if your friend likes Dorkings she definitely wouldn't give up on the breed.  I have 22 month old Sandhill RDs and their temperaments are variable.  I started with 7 hens and 6 roosters.  Six of the hens have good temperaments, and one is sometimes a witch.  Of the roosters, at 8 months old one was a lap rooster and sweet to the flock, one was a lap rooster but mean to the flock, one was mean to both me and the flock, and the other three were average teenage boys -- generally good natured but occasionally tested boundries.  I kept all the hens, but will only be breeding the best four, each of which has at least two great attributes (the disagreeable one will not be bred, as she is a poor example of the breed, and who wants to propagate difficult birds).  I planned on keeping both the sweet lap rooster and one of the good boys who tested me, as those two had the best body shape.  The sweet lap rooster was the smaller of the two (actually the smallest of the group, but I was concentrating on conformation over anything else, including size), and was the submissive rooster.  But in the middle of spring last year the dominant (larger) rooster got sick and had to be removed from the flock during his recovery period.  During that time the submissive rooster took control, and it went to his head.  That's expected, he was just a kid.  But he didn't manage the hens as well, and then when the dominant rooster was returned to the flock the whole social dynamic changed for the worse.  The dominant rooster wasn't able to regain control, having been recently ill, and the new king of the hill became abusive to the hens in the face of competition, so the flock was no longer a peaceful social system.  Eventually I decided that the flock was more important than my initial infatuation with a sweet lap rooster, and culled him as well.  Peace returned to the flock, and the dominant rooster resumed his role.  He is an excellent manager of the flock, and the hens think he's a rock star.  He still occasionally challenges me, but only during breeding season.  He's not a lap rooster, but he's handled every day and minds his manners almost all the time.  He's not the best rooster I've ever had, temperament wise, but he's acceptable, and his other qualities are excellent.  I'm very happy with my group, and have eggs under two broody hens right now.  (Hope they hatch, hope they hatch, hope they hatch...)
 
But I started with 7 pullets and 6 cockerels to select down to 4 hens and one rooster for breeding.  That's a hugely important point.  Birds are individuals, just like people are.  If you went into a public area and randomly selected three people, the chances of you selecting three wonderful people that would all be a great friend, neighbor, coworker, family member, whatever is not that high.  Chances are at least one of them would have some issues that you didn't like.  On the other hand, if you randomly select 13 people, the chances that at least three of them are acceptable are much higher.  And birds, just like people, often change into much different personalities after they hit puberty.
 
If your friend likes the breed but doesn't want to get large numbers of chicks and then select down, she might consider getting an established trio that's over a year old, from a breeder that has the same priorities that she does (some breeders consider temperament a big concern, other breeders say if it's not listed in the SOP, they don't care about it).  Even that's not a guarantee, since different housing environments and different management styles can significantly affect the way a bird acts.  But at least it's a good start.