hiya James,
when my cats died I personally buried them in our back guarden, gave them a gravestone so angels could find them and called the angels with light. Whatever you feel you have to do, simply do it as if you feel it is right then you are surely giving your respect to your mums cats body. Im sending my asteral hugs to you and hope you recieve them well. Animals are like people to people who care, and so its like losing a family member. Hope this helps and hope you feel better, as death leads to new life.

Love and blessings to all