Did Officer Potter really mistake her gun for her taser or was she just trying to get off the hook?

Her defense team will primarily focus on her warning of "Taser, Taser, Taser"...which officers say when they are about to use it in that state to warn other officers to stand at a distance. They will also focus on the aftermath; when she says, something to the effect, oh, no I shot him...

However, the prosecution will focus on her 26 years experience, her experience as the president of the local police union in the past [Where she learned the tricks of the trade]. The near impossibility of misusing a gun as a taser. Taser was on her left and it is in a position that it could have only been removed by her right hand and would have to reach across to access it. It is yellow in color, the weight is different as is the entire feel. 

The prosecution to prevail only must establish gross negligence [reckless conduct], need not show intent for manslaughter. Were I on the jury I would vote to convict; no reasonable officer with her experience and knowledge could have mistaken a taser for a gun. Besides, there was no need to subdue him at that time, he was just going to drive away [run]. They could have taken him in later. [They had all the information on him]. Nonetheless, the defense only needs one person out of 12 to hang the jury.  Acquittal is unlikely, if there is hung jury, she can be tried again.      

Left hand was taser, and right hand was gun. She used her right hand. 

Her lawyers will work long and hard to convince the jury that it was a simple mistake. 

She could have been confused in the heat of the moment, but on the other hand she should have enough training to know the difference. 

We will see. 

Any cop operating anywhere near Minneapolis in 2021 would have to know they were committing at least career suicide (and risking incarceration) by shooting anyone. Officer Potter should have just robbed a bank if she was really that interested in ruining her own life. 

It seems highly improbable that a professional would make that mistake.  Much more likely that she is lying about it.  However there's no way to tell for sure, especially from where I'm sitting.

she probably had that lie in the chamber in case this ever happened.