Hello concerned46

Impulsive spending can certainly be a feature of BPD.
Does your daughter have a confirmed diagnosis? Did this problem occur before she had the pituitary operation? I am coming from a place of not knowing but I wondered if there is any link and if the doctors are aware of it.
How is she managing to do all this on-line shopping if she is in debt-is she putting it on a card or something? Would she agree to take preventative action? Does she accept that it is a problem?
From her description it sounds as if she is trying to regulate her emotions by spending. If she isn't aware she is doing it she may be dissociating-will she let you go with her and discuss this with a doctor?
I also wondered if she is having any therapeutic help.
So many questions!
It is a very difficult situation for you.
I see that you already have a link to the parent's board on your first post-please join us there. you will find a lot of information and support.