Question about facebook?

[Ffgfg]

i sent a message to someone not on my friends list, it goes on her other inbox correct? so now say if were friends on facebook does that mean the messages now go on her regular inbox, cause it still says sent if i click on her name on messenger idk cause i wanna inbox her but will she see it in the chat log if i do? its not really anything bad i just prefer she doesnt see what i said cause it was stupid and i was drunk lol