The little I know – i can promise you kiruv for someone FFB will not have the desired effect. Its one thing for a BT to show them a geshmack shabbos meal or otherwise enticing things about frum life. but someone who is doubting all the things they have been told and known their entire lives will probably not change their minds dur to typical kiruv techniques.
if anything will make more resentful
Going to a rabbi/rebbetzin (or being sent to one) when you are having doubts is like going to a bar to quit drinking. Not only does it not work but usually makes the problem worse