TOO CLOSE

My 2. dog is a Golden Retriever/??? mix. She is a very sweet 2 1/2 year old girl and I totally love her. The problem is that she follows me where ever I go in the house. When I sit in front of the computer she lays on my feet. As soon as I get up to get something out of the kitchen, she is right behind me. This goes on all day long and as soon as I leave the house and come back, she goes nuts. Cries, pees, jumps up and brings her toys as if I was gone for one week...maybe it has to do with the fact that she was found in a trashcan as a puppy. Somebody has just thrown her away and when I got her, I tried to get her trust and gave her as much love and attention as possible. When I left the house she was crying so hard in the beginning that people walking by must have thought I abuse her. Thank god that is over now and I can leave the house without trouble!
So instead of playing with the other dogs she is always right next to me. Doesn't want to play or anything, just be there. I start to think that this is strange. When is too much too much??? Is it my fault cause I kiss and hug them all day long?