In The Crucible, what did Mary Warren have to do with accusing of Goody Osburn?

In 's play version
of , the story Mary tells Elizabeth Proctor in Act Two about the woman in
church who cursed her and made her very sick for two days is actually about Sarah Good, not
Sarah Osburn.  Mary says that Judge Hathorne questioned Goody Good, saying, "'Sarah Good,
[...] what curse do you mumble that this girl must fall sick after turning you away?'" 
Sarah Good lied and said that she only recited the commandments, but when she could not recite
any of them in court, it was seen as evidence of her guilt.  Sarah Good later makes a confession
of her guilt, and so she will spend some time in jail. 

In the play
The Crucible , as far as Sarah Osburn, Mary only says that she would not
confess and so she "will hang!"  Tituba initially accused Goody Osburn of witchcraft
at the end of Act One, and then Abigail picked up the chant and accused Osburn as well.  Tituba
probably...