Perhaps those acts don't prove her direct involvement, but they are relevant. WA's defence, like DAs, will want to present an image of a loving and devoted mother, who had just gone through a divorce, but was on good terms with her ex. Her Mum even baked him banana bread. The defence will present a happy, stable, positive, Wendi, demonstrating that she had even accepted she was going to stay in Tallahassee and heck, kinda liked the place...
If the defence could successfully do that, the States job becomings infinitely harder, especially if WA's defence involves throwing her family under the bus (which is what I predict). Poor innocent WA, she still loved Dan, but her evil family were insisting she move to Miami and killed Dan behind her back. She was in shock and denial which is why she lied to the police.
That's a defence that could almost work if the jury is led to believe the narrative that WA is just a wholesome, well adjusted, doting mother. Now flip that around and if the jury discovers that in reality WA is a mal-adjusted, unstable, narcissistic, psychopath then the States job becomes much easier. And part of demonstrating to the jury that WA is indeed capable of such a heinous act is producing small pieces of seemingly innocuous bits of evidence such as changing the kids names 2 weeks prior to the murder.