It is indeed necessary to give a good birthday gift to your girlfriend's mother on her birthday. It can not only maintain the direct relationship between you and your girlfriend, but also leave a good impression on her mother. Therefore, the gift must be thoughtful. For example, it is winter now, so you can give her mother a scarf, a hat, a set of thermal underwear, etc. These gifts will make your girlfriend's mother feel very warm and touched.
If you haven't met your girlfriend's mother yet, you can give her a meeting gift as a birthday gift. It is good to express your feelings, and the first impression of her mother will also be improved. Of course, when you give your girlfriend's mother a birthday gift for the first time, you must remember to ask your girlfriend if her mother has any taboos, what her mother likes and what she doesn't like, and then give it.
In fact, it is still a good choice to give your girlfriend's mother a birthday gift. First, ask your girlfriend if her mother likes makeup. If so, you can give her a bottle of good perfume, which must be in line with her mother's. Another example is to give her mother a nice watch.