Viviana almost stepped forward, but she held back as she noticed Evander's weird smile. She still doesn't know why Evander invited the Palatini family to Leander's birthday celebration knowing the history behind Helena and Leander.
Whatever the reason was Viviana figured that it won't be innocent.
Like a good little wife, she took a step back. Holding his hand, she hid half of her body behind Leander. Leander gently squeezed her hand and she could say that he appreciated her backing off.
In the end, she cannot interfere in the domestic issues between the couple unless she was asked for help.
She didn't know whether what she did was right or not. But Evander looked disappointed and that was enough for her to conclude that she made the right decision.