Depression can lead to a lessened orgasm or non at all. depression effects ur nervous system and whatever stimulates ur body. she might know it, but maybe she has a chemical imbalance which true depression is. does she seem down a lot?? it might run in her family, or maybe shes just not digging the sex.

could be many things. i'd say if she doesnt show much feeling, but knows that she used to and knows she is a sensitive person, to go to a doctor and see if its depression. anti-depressents make a world of difference in sexual pleasure.

just my 2cents...