I’m maybe speaking out of turn here, but I genuinely believe Beggy has developed a disorder when it comes to shopping to try and distance herself from another disorder she is battling...
Like someone else said, if she’s shopping, she’s kept busy. Plus when she comes home, she can try clothes on for hours on end which again will mean she can avoid eating.
Don’t mean to trigger anyone with what I’ve said but I think it’s glaringly obvious that something is not right there when it comes to her spending and eating habits.