Kaushalya did tell Ranvir how Vasu came before Taj Mahotsav and insulted them, but that was it. The rest Ranvir heard from Vasu's mouth--even the part where she only asked him to marry Ragini during Saalekh's reception just to let Sadhana know that Ranvir wouldn't marry Ragini.
Ranvir now knows that his mother played a huge game with him. Also, Indrajit is on Ranvir's side.
The sad thing is that Ranvir can't be with Ragini unless Vasu herself asks for Ragini's hand as Ragini wants the blessings of the elders in order for her to marry Ranvir and also after everything Vasu has done, there's no way the Sharma family will accept Ranvir without Vasu doing something to make up for the stuff she's already done.
On the upside, loved seeing Malti suffer and her begging Mamaji. Also, loved Avni telling her off. Perhaps now she'll realize who really is on her side.