Is This Innapropriate?

I have a 14 year old step daughter that has some special needs. She looks like your average 14 year old girl and at times acts like one to but mentally she is about 8 years old. She does have interest in boys now but her maturity is way behind and she could easily get taken advantage of. With that said her father and I make sure she is always safe and is never in a situation where a male could take advantage of her innocent spirit. He mother is only allowed 1 supervised visit a week for 2 hours the visits are supervised by DHS our case worker stinks though. She came home from this last visit with 2 Fredricks of Hollywood catalogs that her mother gave her. She hid them but we found them and took them without her knowing. I feel that is WAY inappropriate for any 14 year old girl! Fredricks is straight up raunchy lingerie and later in life yeah that's fine but at 14 she doesn't need to be looking at that stuff. Are we wrong for being so angry about this? The case worker should be actually supervising the visits because she apparently is NOT!