If she likes fashion: lady, fashion or health.

If she prefers literature: Reader, Companion, Youth Digest and so on.

If she prefers cars: friends of cars or something.

If she prefers current affairs and politics, she should choose Jinghua Times and Global Times.

If she prefers to watch mobile phones, she can subscribe to China TV news or something.

You can ask your mother what magazines she likes. Now 50 years old, she is still young. Don't make her feel really old.