I'm wondering at her motive for changing her testimony from direct?
She's got a reason - and she thinks it will benefit her.
What could it be?
I do NOT believe she is giving in - not at all.
I believe her resistance to answering a simple y/n question with a yes is a feature of her narcissistic personality combined with resistance to authority.
She feels compelled to correct him, no matter how petty the detail, even though you can be sure her attorney has told her that annoys the jury. One of the very definitions of compulsion is that the person cannot control it.
Since she was in high school, Jodi Arias has dictated the boundaries of relationships. She starts them, she steers them, she stops them. And a mere man like Martinez is not going to get her cooperation in characterizing her life with Travis. SHE is the important one, SHE is the last word, SHE is the One Who Knows, the one with the secret inside knowledge, SHE is the important one.
This is why she sent flowers to the grandmother, showed up at the memorial. To be omitted from the slideshow would feel to her like a terrible wound and deserved correcting...so she went on 48 Hours to show the family how wrong they were and how important she really is. How only she can really fathom what they are going through because SHE LOVED HIM TOO! She misses him too and if they ever need anything, they can call on her.
Of course that does not include the details of how their brother died, which she pointedly told 48 Hours they had a right to know and she is withholding. See the revenge? She is increasing their pain and enjoying their suffering.
Their crime? They diminished her importance at the memorial.
She is a sadist as well as a monster. Totally lacking remorse, in fact, I hope she leaves her brain to science because we really need to treat infants that share more than three brain characteristics with this creature.