5 years ago my sister started an online business that sold handbags with a friend from UAE. My sister invested £2k and her friend invested £3k, a year later her friend told her that she no longer wanted to be involved in that business. My sister said ok and her friend said I want my money back and literally disappeared and only responded to messages sporadically. Last year she sent my sister a message saying I no longer want the money, my sister is not working and is a stay at home mum with 2 year old twins. Few days ago this so called friend calls asking for her money back even though she said that she didn't want it last year.
Where does my sister stand legally? Baring in mind this person lives in the UAE and she knows my sister's home address. There is no legal contract that was in put in place.