Why not make your mum a memories box including personal bible quotes for Mothering Sunday.
All you have to do is find an empty box (shoe box) or a gift bag or envelop, decorate it either by colouring, painting or sticking pretty paper on it but make it as colourful as possible and look up Bible scripture for your mum.
There are a few examples below:
You are loved forever
Honor her for all that her hands have done, and let her works bring her praise at the city gates.
God bless Mothers
There are many good women but you are the best