Katherine Irlbacher - Buffalo, NY

I'm looking for information about my great-grandmother, Katherine or Katharine Irlbacher.She was born in Buffalo, NY in the 1800s, probably around 1860.She was married to Frank Chretien.She had at least two children, Elizabeth or Bess (birthdate unknown), and John Irlbacher Chretien, born 01 Aug 1885 in Buffalo.I would appreciate any information about the Irlbachers in the Buffalo area.