I think what Bua fails to understand is that she is helping Aarya get closer to each other. It is perhaps because of Bua that Aarti has fallen in love with Yash. The more Bua tries to stand in their way, the more they prevail and soon...Yash is going to start falling for Aarti so... my dear Bua ji, keep doing your evil business and we'll see where this takes..you good for nothing woman!