All relationships take work and effort. A relationship with a believing JW is difficult since the society is very good at controlling it's members and sidelining the unbelieving spouse. If your girlfriend still believes but feels unworthy she will have many issues and feelings of guilt. The DF'ing process is designed to be humiliating and embarrassing in order to bully someone into submission. It can break a relationship because the non JW is seen as the cause of all the problems.
Don't underestimate the problems nor the disruption. As you have children of your own I would take things slowly and make sure that they can cope with the relationship and it's implications. Birthdays, Christmas, Mother;s Day and many other celebrations and activities are denied to JW children. They are also denied to JW adults who also have issues with attending church weddings, funerals and Christenings.
It is clear that you care for this woman and she is lucky to have you but don't rush into anything. It may even be worth having counselling together to explore the main areas of friction as JWs find challenge to their beliefs very difficult to deal with and it can lead to anger. If an expert is there to help it may help her to think more rather than shut down. ICSA does offer exit counselling sometimes free of charge for members of high control groups.