I'd just cut it at an angle along the left side of the diploma.
I just did a google image search for "graduate silhouette" and if you go past the first page there are some that don't have the diploma.
thanks for the replies. I was thinking of just cutting the diploma off as a last resort too but thought I would ask the pros first!!!! I did come across some of the others but could not get a clear enlarged imaged. Low and behold she loves the image with the diploma so problem solved. thanks for the suggestions.