Yes, she is absolutely wrong.
You don’t take a possession that another man bought for his son and use it as your own and have the son catching the bus which defeats the purpose of the father getting out to begin with.
L’s all the way around. The father caught an L here for having a kid with that bird and the other man using something bought for his son, the stepfather caught an L not having reliable transportation and having to rely on something a past man got for his son to help him, the kid caught an L, because he had to take public transportation after his dad got him a car, and the mom caught an L for being a bird and not using better judgment in letting her man use her son’s car that another man bought.