Hi Eve ,
This is the same reply I put on our WhatsApp group , Just to share it with others here ,
Well I think also there is a territorial side for this conflict , that you can also explore more with her , when she said this closeness is too much for her , I guess she felt like territory invasion or like she needs her own space and you can confirm with her more later ! 
The other thing I noticed that we need to know more about the pain to distinguish the characteristics of her conflict , cramps ?bloating? Burning pain ? Anod so on . 
Constipation is definitely a chunk old brain conflict , she definitely isn’t digesting the whole situation , but does it get normal after she leaves her boyfriend! I guess you need to explore with her more about what could bring her more to safety? Or when does she feel normal ? To differentiate her stress triggers more 
And since it’s happening in the family ,we can explore family constellation too ! It may be a pattern running in the family and can be solved! 
This is what I thought of, but plz take into consideration that it may be right and may be wrong :) you can also advise her to do some tapping and also to suggest more Meta Meanings to her to help her go through these feelings