I think if you go slow when introducing she'll be accepted. Sometimes a flock will look at a newbie as an interloper and try hard to make life miserable then other times they will just accept so you'll be there plus the friends to make sure it goes well. Just don't let her go somewhere where she won't be fed and cared for, I don't think you will but it happens a lot over here in the USA people will take their ducks out to a pond or lake or park and just let them go thinking they be able to survive and most of the time they don't. from all you have said in your thread I don't think you'd do that, I just hope that it all goes well when you begin intros. Please keep us updated. Lets see
@onaharley and
@CayugaJana both have Pekins maybe they have seen this breathing in theirs hopefully it isn't something to worry about. What bedding are you using with your duck? I do know from reading others who have Pekin that they tend to over heat pretty easy.