The word "ghost" in the following quote refers to
The word ghost as used in the quote refers to bad memories or experiences Esperanza had when she was at Mango street. The pain of these experiences are relieved and eased as she writes them down.
From knowledge, it has been seen that bad experiences fade away as they are written down or told to someone. Also, there's a saying that says "time heals all things", therefore, time and writing helps to reduce pain of bad experiences.
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