Margot,
Unfortunately, the record was not handwritten. There was a Kilcremine, Roscrea, Offaly. According to the Townland website, Roscrea Civil Parish included parts of Offaly and Tipperary. Have you checked the Church of Ireland Parish Names? Since Mary Ann was travelling with a minister, the parish name might have been used. I tried to find the ship record for the Reverend, without luck. Relooking at the document, based on the other letters, could the first letter of the townland/parish be 'H'?
On Ancestry, there are over 200 trees with George Hipwell and Mary Ann Rawlins. Their family went from Ireland to Australia. One of their sons was born in Offaly. George died around 1860. I have not checked all the trees but found only one with Mary Ann Hipwell. Her father George died around 1840 and her mother Mary Ann Rawlins remarried. Mary Ann Hipwell came to Australia in 1841 and married John McGee in 1842. Is this your tree? On Ancestry, I found 1901 death record for Mary A. McGee, Wellington, NSW, parents George and Mary A.
Regards- Mary