Read the letter. The link has been provided. In fact the most pertinent part has been underlined. Couldn't make it any easier. Besides the letter there's Silvia Odio's testimony.
I did read the letter. Assuming that it has been translated accurately, where does it say anything about anyone coming to her apartment or when or how many?
Here's what it actually says:
"Tell me who this is who says he is my friend -- be careful, I do not have any friend who might be here, through Dallas, so reject his friendship until you give me his name. You are alone, without men to protect you and you can be deceived."
So I'll ask again: where does it say anything about anyone coming to her apartment or when or how many?