This may sound odd, but in listing how she spoke of doing it, it makes it sound as though you are setting up an alibi. If you really want to protect her, don't put details on an internationally-public forum. I know, the forum is for situations like this, so I am not trying to discourage your openness.
But think about who you talk to -- people who are not involved in the situation are usually a good idea (as you have seen with your mother's reaction toward custody). In giving so much detailed information, people you know who run across this thread are going to start putting pieces together.