Like eveyone else I too think maasi went overboard with Shraadh & curse.Throwing Jay out of the house was the only way she could keep Bani in WM.
She knows Bani doesn't want to be any where arouund JW after what he has done to her.She is again in same or even worse state than after loosing her baby. That time ( as Pushkar mentioned to Jai) she had her love for JW as supprt. Now she doesn't have anything. She needs love & care of family.
At present she is so mad at Jay that she is not thinking about him. Anyway Bani is more devastated & she is not at fault.
I wish maasi had reacted the same way after the property issue was resoled with Jigyasa. But may be knowing Jigs such behaviour was expected. Maasi loves Jay & not Jigyasa. Thats why she has higher expectations from him. Thats why she is more hurt by his mistake.
I hope someone may be Aditya gives Jai chance to explain what exactly happened & the fact that it was ONS & not an affair from his side which he regreted right away. Somehow every one has ignored how much he loves Bani. And it is killing him to put Bani through this for one moment of lost control.