wow, i would be so pissed if my friend did that. they would hear about it the second i saw my dog looking like that. she had no right to cut his hair. who does she think she is?? and being that she's a groomer she should be able to get a mat out without shaving the whole dog down, especially if its silky hair. cotton coats are harder but it can be done.
i'm so mad for you. when i read your first post the anger just swelled up inside me and i was like "WTF??"
i don't know if what you did, or didn't do, was better or worse.
if i were you and didn't say anything to her when she dropped the dog off, i'm probably continue to ignore her for a while.