1. Tell her what her bad habit is directly, let her know that she has this bad habit and decide to get rid of it. Many people don't realize what bad habits they have, so they won't correct them What's more, they don't think this is a bad habit, so if you find your girlfriend has a bad habit, you should tell her immediately, let her know that her bad habit is bad, tell her that her bad habit may bring her harm, and tell her that she must change that bad habit, otherwise it may ruin her life.
Always remind her not to forget that bad habit. We often forget some things, in fact, it is also true to correct shortcomings. Because it is a habit, it is particularly easy to forget to correct it. At this time, we need someone by her side to constantly remind her not to forget. Don't worry, she may find you annoying or her relationship with you has changed. It doesn't matter, because one day she will know that you are doing it for her own good.
It is not easy for two people to be good friends, and it is even more difficult to be girlfriends. Maybe two people will have conflicts because of this, but you are sincerely good for her, and she will understand.