Saving image files sent over Whatsapp?
 

I tried looking for an answer to this, but couldn't really find anything.

Whenever I send a picture to my mom over whatsapp (I have an iphone4 and she has BB Torch), she can view the picture and not save it. I've tried everything, but somehow, I cannot save it on the phone. Is there a specific setting I need to look at? Or have they disallowed saving of images?

Any help would be appreciated. Thank you :)