I think that is your own projection; The OP already mentioned that his female engineer is an awesome engineer, so I'm assuming she is qualified to be there from an engineering perspective (and I'm not saying she needs to be the only engineer there). And the organization is looking for a check to make sure the hiring team is not discriminating against women, having a woman there hopefully should help. At a minimum it would prevent outright sexist remarks during the discussion of candidates as making them in her presence would reasonably constitute sexual harassment. Also not to be over looked, the presence of a successful female engineer from the hiring organization may also make female candidates more comfortable.

As for dedication, I mean dedication to not over looking awesome female candidates, intentionally or otherwise.