Afternoon tea served on the best china (cups) in the house. Dainty (if available, otherwise dress plain plates with d'olyied shaped white paper) china plates filled with jam filled sponge cake, scones and thin cookies(biscuits in the UK and Ireland)
Serve with tea/coffee in a (matching, preferably) dainty teapot or coffeepot.
Send an invitation to some of her friends for afternoon tea.
Dress appropriately to serve and wait on Mother and her friends, in best day dress, full make-up and hat to match or business suit
Total cost : about 5 euro/dollars and a few sweaty hours in the kitchen.
Thanks for the question.