|Well, I don't have anymore breast milk
Personally, I have no more breast milk in my breast about 3 to 6 months after I have weaned my baby. However, I believe that it IS possible to have breast milk in your breast even if your child is very old or even if you do not have children.
It is well known that women can induce lactation. Basically, some women who adopt babies and want to breastfeed, can pump their breast before the birth of the baby so that when the baby arrives, their breasts are ready with milk inside.
In some cases I have heard of grandmothers breastfeeding their new grandchild because the baby latched on and there was milk in Grandma's breast.
I have also heard that sometimes when a woman has just had a still birth (baby just died soon after birth), she is very emotional and can have breast milk in her breast for months even though she never nursed the baby ever.
Anyway, I think it is rare to have breast milk in your breast after 14 years - but it is not impossible. I recommend that you friend sees a doctor to make sure that she doesn't have a more serious problem like breast tumors or hormonal imbalance. And if the Doctor say that she is fine, then she is fine.