Like many pointed out and Supported Ragini yesterday,spare a thought for that Angel that how even her own world shattered after knowing that she is not the biological kid,still she is trying her best to clear the misunderstanding and still consideres her as her own mother and hence i dont think she deserves Raginis anger and hatred.
Reveal to your daughter whatever you know that Suhaani told you the purpose of her visit and that Nachiket is not her real father..Im not saying Ragini will start loving Suhaani all of a sudden once you tell her,but atleast she will realise she is not a cheater and her intenetion was not to play with Raginis emotions.
If ragini is unlucky that she had kids like Aarav and Nishi who never understood her,it applies to you too.You are the worst mother for Ragini who did nothing then and even now.
But i know you and RK belongs to same club and you wont open your mouth untill the DNA report reaches to your daughter and then she will break down furthur for not trusting her Nachket and even then you will stand in a corner and will do nothing.