Searching a host family for 3-4 weeks in summer

Hello, I´m looking for a family which is able to take my daughter (19, no smoker and no alcohol) for 3-4 weeks in this summer. She needs practice her english for the school. There she is to silent and don´t believe in her speaking. I like to see her in a family because than she have to speak and is not able to use german. It should be like normal days and not holidays. Hope to hear from you.
Greetings from Hamburg