Ouch.
If she doesn't want to be your friend then she's out of the picture. It takes a lot of guts to tell a guy you don't want to be friends.
I always thought that "let's just be friends" when said by a girl meant "I hate you" and in your case V5, I must assume that "let's just be acquaintances" really means "I'm going to send my psycho girlfriend after you to kill you and make a lamp out of your genitals".