Barrett's testimony implies that she thinks all people can simply
choose their sexual orientation.
I don't investigate all the associations and attitudes of an
organization before I give a talk for it. I don't have time.
(Indeed, I expect, when I give a talk for a university, that it is
doing some harmful things that I publicly condemn, such as developing
nonfree software, obtaining software patents, and teaching that it is
wrong to share copies of published works.)
So I think it is possible that Barrett did not know about those
specific positions of the ADF when she gave talks for its fellowship
program.
But it is also possible that she knew them and agreed with them, and
is now covering it up.