In fact, Cao Shi in history died shortly after the founding of Liu Bang. Cao Shi in this play did not follow Liu Bang into the palace, but stayed in her hometown, because she knew that Lv Zhi was a very vicious woman and had great power in the imperial court. If Cao Zhi followed Liu Bang back to the palace after the founding of the People's Republic of China, it would not be good news for Lv Zhi. Moreover, Cao Zhi's natural disposition was smooth, so she certainly wouldn't choose to enter the palace.
And in fact, Cao Shi really doesn't need to enter the palace. Although the bitter days ended after entering the palace, the rest were good days, but she could enjoy the same good days when she stayed in Pei County, because everyone knew that she was Liu Bang's woman. Therefore, you can enjoy a good life without taking the risk of entering the palace. Why take the risk?
Besides, we all know how evil Lv Zhi is. It's always scary to be with such people. If Liu Bang dotes on Cao Zhi very much, it will inevitably lead to Lv Zhi's jealousy, then Lv Zhi will probably retaliate against himself, and then Cao Zhi's life will be hard and miserable. If the two of them really make trouble, Liu Bang will certainly be unhappy, and may even take it out on himself, and may even implicate their son Liu Fei.
We all know that Liu Bang and Cao Zhi gave birth to a son named Liu Fei, and Liu Bang still loves him very much. If Cao Shi followed Liu Bang into the palace, it would probably have a bad influence on his son. So no matter from which point of view, it is very wise for Cao Shi to stay in Pei County. In addition, Cao Shi's failure to follow Liu Bang into the palace will definitely make Liu Bang feel very guilty. Therefore, he will certainly be more friendly to Liu Fei.