"佢唔鍾意我寧願同工人住都唔同佢住!" --- your 99 is very funny !!! She is so stupid as she is comparing herself with 工人. She is also very stubborn, jealous & narrow-minded. She doesn't think practically for the whole situation. She just thinks if she can 'help' you to cook/look after bb, then she will be the QUEEN !
I think she deliberately to buy a car for her son rather than employing a maid for you, to show that she 'may' treat you well if you completely obey to her (i.e. 同佢住). My 99 is also like that. I don't 'so' her.