Of course there is a solution!
Think about what else your mother-in-law likes besides mahjong. For example, square dancing, then you buy her a set of dance clothes and take her to square dancing. If your baby is of comparable age, then take the baby with you. Square dancing with your grandchildren is something that many old people enjoy.
And whether or not your mother-in-law likes to sing, if so, then buy a sound card and let her do Karaoke for all.
My aunt used to be addicted to playing mahjong, and then after my aunt bought back the sound card, my aunt almost didn't go out to play, every day and my aunt grabbed the K song. Seeing that my aunt likes it, my aunt did not grab it with her, and went to the study to practice writing.
Or dig up what other special hobbies your mother-in-law has. For example, cross stitch ah, catch up with the drama ah, or whether your mother-in-law likes to study food. If she likes it, then buy the ingredients and study it together, not only can you satisfy your family, but you can also publish a book.
Or whether your mother-in-law loves beauty, if she does, you can enroll in a yoga class with her and practice yoga. I think either one is more meaningful than playing mahjong.
My sister-in-law's mother-in-law used to be a mahjong fiend, and sometimes she didn't come home for meals. But one day, she realized that her mother-in-law was particularly interested in the yoga she practiced, so she enrolled her in the program. Now she is practicing more actively than her sister-in-law, and mahjong has long been forgotten.
What's more interesting is that she's also trying to persuade her former mahjong sisters to practice yoga with her. Seeing her mother-in-law quit mahjong, the little aunt is especially accomplished. Her husband is also loving her more and more.
There are many kinds of joys in life, choose one to cultivate with your mother-in-law, which can also enhance the relationship between you, why not?