The mother wasn't acting rationally. I know pregnancy can turn the nicest women into raging lunatics, so I'm giving her the benefit of the doubt in saying she was under the influence -- of hormones.
There's always more to the story than what the media offers. Was she protecting herself and children at home (born and yet to be) from a biker who followed her home and is now on her property screaming for her to come out? Was the man trespassing? Threatening her verbally?
I'd be pissed, adrenaline racing, if someone tried to run me over intentionally, assuming that's what really happened. Maybe the biker could have parked a block away, called 911, and waited out of sight for the Cops? Maybe he didn't want to call the Cops (arrest warrant out for him? history of violence and arrests?)...
Sounds like 2 people raging and both making bad judgments. If she did ram him on purpose, he has a right to use his gun in that moment. While following her home, he became the aggressor/pursuer. He may have a hard time claiming self defense since he had the option of not confronting her at her home.
Yes, it'll be an interesting case.