Burial insurance provides a death benefit payout upon the death of the insured person (Your Mom).
Upon your Mother's passing, the death benefit from the burial insurance will be paid to the beneficiary (You) which can be used to cover the cost of your Mom's burial and related expenses.
There are guaranteed issue burial insurance policies available, so even if your Mom has health problems, you can still get insurance for her burial expenses.
Here's how to buy burial insurance for your Mom.