Sounds like your dd may have abandonment issues after the break up of your marriage. What happens in childhood and how we cope with it can end up becoming a problem to us as adults.
Counselling would help her to see the patterns in her relationships and help her to move forward. If she doesn’t feel open or ready for this there isn’t a whole lot you can do other than maybe to ask her if she feels there is a pattern to her relationships, or maybe buy her a book on this subject.
4 Years On…..Health-wise, Has Anything Changed?
To think that London, or anywhere else for that matter, does not belong to any one demographic