I agree with you nets.. There will be surely a rift between suhana and disha for kushi...
On Mahaepisode suhana expressed her feeling towards kushi...
I think when suhana saw the baby alone in the park, her mind was filled with Disha can't become pregnant ... So she should give this baby to Disha Bhabhi... But when she lifted the baby into her arms..Suhana started to get motherly feelings towards the baby... In that single moment she became the mother of Kushi without her knowledge..suhana started to feel as a mother for Kushi..
But when she came home with baby, she knew that the baby is for disha , as disha can't have a baby.. Suhana gave the baby, but her motherly feelings didn't change for the baby...
Even Ishaan & rajni have told her now disha is the mother of the baby.. Suhana agrees that disha is kushi mother, at the sametime, wants to be mother of Kushi...Suhana says she is MAASI, MAA JAISI..
Seeing the baby and being with Kushi gives her happiness and somewhere in her heart, she wants to be the mother of kushi, but also knows that she can't claim the baby as she bring it for disha and she can't be a selfish and take back the baby...
Suhana love towards Kushi, will surely bring problems with Disha.. As now Suhana is taking care of kushi in the mornings when disha goes to school... Soon Kushi-suhana gets attached with each other.. Somewhere disha will want suhana to back-off and leave kushi with her.. suhana couldn't stop herself from loving kushi, even though knowing disha is feeling bad, but couldn't stop herself being with kushi...
I think in future rift will come, disha will say suhana shouldn't meet kushi, Rajini, Ishaan are will support disha, as she is the mother, But suhana will say, she became mother when she lifted kushi 1st time in her arms, and when kushi first said MAA to her...Suhana will say, she can't claim motherly rights on kushi.. but will be there for her as a mother...