Suizi was a thoughtful person, her intelligence always at work.
Even though she didn't initially gauge her mother's intentions, given some time, she calmed down and understood.
Chen Lijun brought Shen Liangyin back, not to upset Suizi.
She found a puppet, as training for Suizi.
Or even, as training for Yu Jingting.
As Chen Lijun has said before, things have changed now.
The situation at the Fan Family has become turbulent. Fan Huang, not content with just being a man behind Chen Lijun, wanted to be with her openly.
Then, Suizi will no longer be an obscure farmer girl from the Wang Family. She and Yu Jingting, whether willing or unwilling, are already caught in the struggles of their large clan.
Even if Suizi doesn't want power, and Yu Jingting isn't interested either, the other families wouldn't believe that she and Yu Jingting have no ambition.