Hey Sarah:
Same as Kat: "Department of Redundancy Department."
The mechanism (molecular mimicry) is the same, but whereas we don't want to produce the damaging IgA, she should avoid producing IgG. I don't have a lot of experience with this regular form of RA, but can send to You the technical papers. I'm scanning one in now that "proves" it is caused by the pathogen Proteus mirabilis; if You are interested, send an email request before I leave town...next Tuesday!
Good Luck to you each,
John
