My take on it is the officer that zapped her is "probably" a gung-ho Barney Fife newbie that sleeps with his gun and masterbates to the municipal code and city ordinance manuals.
The Tazer alone was bad enough, but did he have to shove his knee into her chest? Older people, especially women, are very susceptible to broken bones.
I may be mistaken, but are'nt they able to mail a traffic ticket, especially a non-moving violation? The department is wrong for not disclosing the punishment, it gives the appearance they are trying to hide something. This is a situation where honesty, openness and communication would be the better course to follow.
And for what it's worth, a few bad apples do not reflect the vast majority of good, well meaning peace officers and vice-versa.