Afterschool help and ad hoc babysitting

We are a busy family of five and have three beautiful girls
Aged 13, 10 and 8.
We are originally from the UK so have no family in Australia, having a nanny to help out has been a valued and important part of our family.
Our current Nanny has been with us for 4 years while studying for her teaching degree which she is just finishing.
We are looking for someone we can get to know and can help with after school activities, lunch boxes and laundry with occasional weekend sitting.
Would be lovely to find someone our girls can be friends with now they are a little older.
Flexible on days