@Robin93, people see the prices in whatever currency they have set. So if she is seeing yours in a different currency, it means her currency is set to something other than yours. For instance, I see your price in Canadian dollars because I have my currency set to that. I see everyone's price, no matter the country, in my own currency.
It is nothing to worry about. If she has her currency set to something other than she wishes, tell her she can change it in the grey area at the bottom of her dashboard. There is a dropdown for language, and one for currency.