You can take her around some representative places in Nanjing, go to the Confucius Temple, try the eight wonders of Qinhuai and buy some gadgets. If the weather is fine, you can climb the Purple Mountain in the afternoon. Climbing the mountain alone is free, or you can buy a ticket to visit Sun Yat-sen Mausoleum and climb the Purple Mountain. It is very emotional for two people to climb mountains together. There are many scenic spots in Zhongshan Scenic Area, such as Sun Yat-sen Mausoleum, Presidential Palace and so on, all of which are quite close. Underwater world is ok, but it is estimated that she is from Shanghai. Maybe this Shanghai is better than Nanjing. I think it's good to live in a dormitory. My classmate came to live in my dormitory, which is a bit crowded, but everyone is about the same age, including your roommate, so we have something to say, living at home may be a bit stiff.