1. Direct communication: You can have a frank talk with your mother-in-law and tell her that you feel uncomfortable. You can say, "Mom, I know you like me very much, but calling me ex-girlfriend makes me a little uncomfortable." I hope you can change this name. "
2. Ask for help: If your mother-in-law is unwilling to change this behavior, you can talk to your husband and ask him to help you solve this problem. He can communicate with his mother, or let you two communicate together.
3. Avoid sensitive topics: If none of the above methods work, try to avoid talking about sensitive topics with your mother-in-law, such as her past or your love life. At the same time, you can also try to establish a better relationship with her, so that she can know you better and change her view of you.
No matter which method you take, you should remain calm and respectful. Although this problem makes you feel uncomfortable, it takes patience and hard work to solve it.