When your girlfriend comes back from a business trip, you should reward her well. This is the standard of a model boyfriend. I think your first choice is to give her a big bouquet of roses, and then invite her to a quiet restaurant for dinner. This will show your thoughtfulness.
In addition, your girlfriend has been away for so long, she must miss the taste of your city. Besides, you can talk about the interesting things that happened recently while eating. I think this method is the best way to enhance your relationship.
In addition, you can give her some small gifts, such as rings, necklaces, etc., which are all fine. Or you can give her a Swarovski diamond-studded makeup mirror. Every girl loves beauty, and I believe your girlfriend is no exception. Such a gift is classy and your girlfriend likes it. Why not?