One of DD's friends (year 4) comes over for tea quite a bit but she only ever uses a fork to eat. I don't usually say anything but last week I served spag bol and she used her fingers in place of the knife to pile the food on the fork. As a result her hands were extremely mucky throughout. At one point I saw her hand disappear and it looked as though she was wiping it under the table. I handed her a napkin but I am really against kids touching their food when at this age they should know how to use cutlery. How would you handle this? Say something to her or just make sure I have plenty of napkins?!