Consider your mother's age, health, how long she needs life insurance, and what she can afford to pay for her life insurance policy.
These will all factor into finding the best life insurance coverage for your mother.
If she needs life insurance for a period of 30 years or less, then a term life insurance policy may provide the most life insurance at the lowest cost.
If she needs lifetime coverage, which costs more, then a permanent life insurance policy may be a good idea.
Or, she could buy a small permanent life insurance policy to provide for her final expenses, and a larger term life insurance policy to provide more protection for up to 30 years, depending on her life insurance needs.
Here's an article that explains term life insurance vs permanent life insurance to help you better understand how they work.