After graduation, college classmates should be considered to be close friends. No matter how close you were before, classmates are always more intimate than colleagues. However, you should contact your other classmates more and consider some specific situations. For example, the range of gifts you give to other classmates, and the general level of gifts in your circle of life. As long as you are at the general level, it will be fine.
You can give a little more, firstly to show your friendship as classmates, and secondly, she will return the gift when you get married. However, you must not give too much more than the general level, because your relationship has not reached that level. If you give too much, people will feel uncomfortable and think that you have some intentions. Haha, it is best to discuss it with your other classmates, because your relationship with classmates is a long-term relationship, and it is best to make some long-term plans.