Now that your son's girlfriend is baptised there will be enormous pressure on him to follow . She will be advised to not date him until he has made certain his intentions of following the cult . It comes down to the unevenly yoked illustration .
Our oldest son was baptised and the girl he loved was raised a witness ,but had not yet been baptised (she was studying with a pioneer with the intent to baptism ). The Elders gave talks about how wrong this dating was (w/o stating names ,but everyone knew who they meant) It lead to people marking her (my son didn't live in the same congregation) . NO one would come to her bridal shower ! After being in this small congregation all her life and everyone knowing her ....it really ticked me off people were so petty . I was so proud of her for sticking to her guns and not allowing others to push her too fast . They ended up marrying in Las Vegas ,and she never did get baptised . They have beeen married six yrs now . Her best friend from childhood married her brother ,but doesn't talk to her anymore just because they quit attending meetings .
I hope the best for your children .I think you have done a great job helping them to have a reasonable,balanced outlook .