Ok let's assume and speculate then... Maybe she did something she regret? Or she had a bad experience with a guy outside the house? Ever thought about that? Maybe she had a fight with a girlfriend etc. etc,....
.I saw it too and what is 100% evident is she left the house knowing what went on in the bedroom and she did not look one bit sad when she left the house... So stop speculate and assume...You will never know what's up-side-down anyways!