Legally, there's no argument. Videos don't lie; she's guilty of assault, though I doubt she will serve serious time. Probable cause and "discovery" of facts may be in the pocket of the prosecution, but sentencing will be a different ball of wax. A judge will weigh a slew of mitigating circumstances, and will likely excersize a goodly dose of latitude and discretion.
No arguing that sensationalism is painfully eroding the integrity of TV news. I've witnessed plenty of stupid beat reporting in my time, though, I can say with confidence, never at stations where I was employed, but this one takes the cake. Sadly, a presumably talented and promising female reporter of high career potential will be forever stigmatized by this video as a stereotypically blonde-haired TV bimbo. She may never shake the humiliating episode of a panic-striken reporter, two viscious pit bulls in pursuit, desperately and clumsily pattering off in high heels.
Thankfully nobody was seriously injured, so don't be surprised to see this incident mercilessly lampooned on Saturday Night Live.