If Shyam told Dadiji everything then how...

Did she not know Arnav had got married? maiin reason Arnav threw Shyam out was because he betrayed his sister and misbehaved with his wife right. when Shyam's truth came out he kept blaming khushi which I'm assuming he would've completetly twisted the story and fed Dadi the same lies blaming khushi so wouldn't she have asked who Khushi was? or was she pretending not to know hence why she dislikes Khushi so much? I apologise in advance if you all think its a pointless topic or if its already been posted if not then please share your views.I'm usually a silent reader but just thought I'd share this