Your son goes to her house and stays there, presumably, so I have to say it appears you are BU to get so enraged she is sitting in the car outside
tbh, I would have to wonder why she did that...does she need to naviagte or summat in case your exH forgets where you live [hwink]
why can't she just stay at home ?
however, she isn't trying to come in your house, she isn't trying to talk to you...she is just there so you have to suck it up, I am afraid
personally, I would feel sorry for her
it appears she is rather insecure, needing to check that her lovely husband isn't fraternising too much with the fragrant ex wife
pity her...she is probably terrified he will do to her what he did to you
karma can be a bjitch ...