Donegal ancestry

I am trying to find information about about my great-great grandmother Sarah Rose Patton or Patten. She was married to John Moy (1815-1869) and they had eight children. She was suppose to be from Ballyshannon according to family history, but died in Ireland in the early 1850's . All of their boys had Houston as a middle name, so there may be some connection there. 

Her husband John and all eight children emigrated to the U.S. In the 1850's. They were Rose (1834), Sarah ( 1837), Margaret (1839), Ann (1842), Michael H. (1843), Patrick H.( 1847), Catherine (1848), and John H. ( 1850). 

Any suggestions as wherer to look for birth, baptism, marriage, cemetery records would be greatly appreciated. I will be in Donegal in June.

Thanks.

Chris