Who were 'Maggie' and 'Miney'?

There's a few challenges in the handwriting on this postcard sent in 1906 from Newcastle to New Zealand.

Was this a postcard from one sister to another?

Dear Maggie,
Hope you are quite well. I have not heard from you for a while.
Don’t know whether you received my last cards or not I sent you. On the same day as ... sent .....
I am going to Sydney next week for a month’s holidays. I will send you some from there
With love from
Miney