When Kaily heard his brother was with another boy she was over the moon thinking she could make Krish break up with him and come to her. So she specially asked for Noah's picture. Then she planned to show it to Krish and break their relationship as soon as possible.
The reason why Kaily was trying so hard to marry Krish was that she had liked Krish for a long time.
She knew Krish wasn't someone who managed a proper relationship. But she still tried to reach him. She was like a crazy one.
Krish was so sick of her. At first, she just confessed. After she got rejected she forced Krish. Krish rejected her because she hated her for making trouble for them.
She didn't want his love. She just wanted to own him. She didn't give up. She told her dad that she wants to marry him. Then he talked about her idea with Krish's father.