I have St Mary McKillop, known to us as Mary Helen McKillop, in my family tree, albeit done by a cousin from New Zealand. It's way too extensive to post the details here. Perhaps you might care to contact me at sluggan@gmail.com and I can give you her contact details. As my family are Camerons from Kilmallie, you might expect us to be related, but as far as I can work out, St Mary is related to me through the McRae family, of Maurice McRae of Clunes (1280 - 1350), first chief of Clan McRae.
Regards,
Donald M P Cameron.