Greek tutor for 7 year old bilingual

Hello,
I am looking for a Greek tutor during July-August to assist my daughter - Victoria - with her Greek language skills.
We live in the UK and Victoria's primary languance is English. She goes to the Greek school every Saturday for 3.5 hours and also doing private tutoring in Greek.
She will be based in Porto Rafti, Attica during the summer for two months and we are looking for someone to come in twice a week for 1 to 1.5 hours.
Only in person , not interested in online lessons.
Giannis