It's true that she's being a little too trusting and naive with vedika but I think she just doesn't want to upset Ram as she keep thinking and saying that whenever they talk some misunderstanding makes them fight and also most of the time Ram take her genuine concern as taunts too. So I think she's trying to be understanding and also she keep thinking of all Kapoors and their friends as "elite group" so maybe she just doesn't want to question their "norm"🤦
And also she perceives herself as a collected and composed person who is practical and not emotional maybe that's why she's putting vedika in a category where vedika is going through something bad and as a decent human being Priya doesn't want to create a scene. And by the way vedika's behaving in the precap Priya will definitely start seeing vedika as a victim of abusive relationship and put all vedika's actions against akki as a projection of vedika's own wounds. Priya will think because vedika is in a bad marriage that's why vedika was genuinely worried about shivina and I think priya will also forgive vedika solely because of how vedika will be presenting shashi to Priya. Priya doesn't know shashi personally and with all the lies he had webbed Priya will believe whatever cooked up story vedika will feed Priya and Ram.(Although I really hoping against it )
But I think this vedika drama can be good for Priya as after seeing vedika near Ram she will start to see faults in her decision of letting vedika stay and also she will begin to emotionalize more with Ram and the shell around her which has started to crack will/can be broken and the real journey of their love can begin😌❤️