If my sister's financial situation is not good, I gave you 1000 at the beginning, which proves that she has deep feelings for you. Now, if she is not in good condition, as a sister, it is time to help her. Because my son's going to college also brings a lot of expenses to his family, including tuition and usual living expenses, and there is also a round-trip fare if he goes far away. In the past, many children from poor families could not afford to go to college. At this time, the money you gave her is undoubtedly a timely help, which can be 2000, 3000 or even tens of thousands, depending on your family conditions.
If your sister's financial conditions are ok, it is your intention to give more and less. Courtesy is human nature, and the amount of gift money means blessing.