At the begining it was OK, but now I have several holes in my wall, ita becoming problematic.
What can I do to force her stop doing this?
You are offering grit free choice? Never heard of a grit that has vitamins. Can you post a picture or a link of the particular brand you are using?
Grit is usually just crushed granite. As far as her eating the side of the house, you would need to block her access to it by placing a board over it or fencing it off. What type of food(s) do you feed?