C386 Mommy says she's got everything

There were two keys to Lin Shumo's room. One of them was on Lin Shumo all year long, which was the one that Mu Ziyao had taken out from the box that he was given by the assistant, so why did she still look for Lin's Father to ask for it after taking it out? On one hand, it was because the room she lived in was rather private, and the key was in Lin's Father's hands, on the other hand