She came from a messed up family of origin. Her big brother died in a car wreck in 1983. The investigation said it was a mishap. She later claimed that he committed suicide by driving into a tree. Here it sounds like she hit one building, then right away got up an incredible amount of speed and plowed into another. She may have been trying to kill herself.
Negative - she drove away from the minor collision with a garage building corner, then drove away at high speed. The final crash was a significant distance away.
A video of her driving away from hitting the corner of the garage is at this link: https://www.tmz.com/2022/08/08/anne-heche-new-video-fly-down-alley-before-hit-run/
More on the initial collision here; https://www.dailymail.co.uk/news/article-11086701/Anne-Heche-drunkenly-crashed-garage-plowed-house-causing-flames.html
Between the garage collision and the centerpunching of the house, she was apparently driving around and around an area: https://www.tmz.com/2022/08/06/anne-heche-new-video-speeding-residential-street-before-crash/
It wasn’t just a speed-off-then-crash-suicide-immediately thing.