Why is Robyn ashamed of her obsession?

Before everybody says it was to hide what she spends on them, that’s bullshit. She didn’t mind an expensive Hawaiian vacation, the bigger more expensive house, the ATVs, etc. she doesn’t hide it and I suspect always loved rubbing that in to the other wives. I won’t accept that reasoning.

Why is she so ashamed of the dolls? Why has she ever mentioned this hobby on camera? Did the rest of the family beg her not to out of embarassment? Is she so odd about them she’s lost friends over this so she knows it’s weird? Does she have less of a hobby and more of a psycho type derangement? Any ideas?