She wanted to just get a glimpse of Dev and make sure he is ok.. she didnt want to have a conversation with him (if she called then he would know that she came there to meet him). She just wanted to see him once and make sure he is OK...
She did not go there to remind him of their love or to show that she is missing him or even hoping that they will reconcile
So she goes there saying that she left something there hoping Dev will be around and she can relax if he is ok and Move on.
But obviously Dev is waiting for her at her home and Ishwari maat is never going to tell dev that Sona came there searching for payal.