Aunt Harriet was found dead in the lake and her baby was missing.
The book never gives us this information. It is apparently something small from the way Harriet talks about it.
We know that Harriet died. The book tells us that she was found in the river, but we don't know if she drowned or she was killed another way and then her body dumped there. The book hints that her death was not by her own hand. We don't know for sure what happened to the child, but it was almost certainly dead before the mother was.
Your aunt's baby is your cousin.
Your sister's aunt (who is also your aunt) is the baby's great aunt. The baby is a great niece or great nephew of your sister's aunt.
The great aunt is the great niece's baby's great-great aunt.
Yes. You would definitly be an Aunt!
Your aunt's baby would be your cousin
You become an aunt or an uncle depending on what gender you are.
Gertie
somewhere
yes she is a girl
An aunt!