I'm asking because in my culture, this kind of action is very strange . If my mum wants a support , she should take an empty trolley , but i wont give her a full trolley with thongs.Why should she use the trolley since she always walks without it?.

Read :

Your mum always walks without a trolley ,so she can walk in shopping malls without a trolley also. Your mum cant even push the trolley you have given her because it is too heavy, so how can it help her to walk?