Seeing your question reminded me of my counselor. In fact, counselors are more like our friends than our teachers. They take care of us all the time. You should indeed give her a gift to express your gratitude. Here are my suggestions, I hope they can help you.
1. You can choose some practical and commemorative small things to give to your counselor, such as pen holders, calendars, pens, etc., which your counselor will definitely use.
2. From your question, I know that your teacher is a woman, so you can give flowers, girls like flowers, or you can give crystals and the like, I especially like purple crystals. Girls have no resistance to these gifts.
3. You can also give some small potted plants. Like cacti, they are small and cute, and they can be placed next to the computer to prevent radiation.