She is fine

Liu Hui Ying did not say anything anymore, she had long sensed that something was wrong with the small grave which she saw when she arrived at the hunting grounds.  Back then when she was attacked by someone when she was standing next to the small grave, she thought that she was being attacked because she was the queen and nothing more but now that she knew that the murderer who killed Madam Qin and concubine Qin stopped by the small grave, she had a feeling that the person did not want her approaching and finding out about the secret of the grave which was why when that person saw that she was digging that small grave, he attacked her.

It must be because he was worried that she will see something that she should not be looking at.