I suggest eg Buy her a present. It won't make her unhappy. eg Buying her a present won't make her unhappy. eg Buying her a present will make her happy. eg A present will make her happy.
It is difficult for me to answer your "question" because there are confusing components. It's better to give a sentence and ask for correction. I'll try. [ It would make us very happy, by the way, if you were to register here with a user name so we can get to know you better, which helps us answer your questions! There are other advantages to registering as well. ] Buy her a pres