I'm very wary of speculating based on nothing at all, but my guess is that Arias has intimated to her mother that mum needs to throw herself, her parenting, her other kids and her husband, under the bus in order to save the life of Arias herself.
Arias's mother baulked at this, so her usefulness to the convicted killer is now over.
As to the rest of this next phase, since I have now entered the thicket of Wild Assed Guessing, I predict Arias will quote from the Bible, The Book of Mormon and possibly Zen and The Art of Motorycle Maintenance.
She will strongly imply that, if given more time (eg a lifetime until natural death of old age) her Fognesia may lift. Indeed, some memories are already returning, and she just needs more time (and a book deal, all proceeds to victims of DV and Pedophilia, of course!) to piece them together.
She will insinuate that the Juror's should not cruelly deprive the family of the 'truths' she has to tell, and the 'closure' that is in her gift' by causing Arias more stress than she has already endured during this trial.