I match with a lady from with nearly 100cMs and we have yet to figure out how we connect. I have a 48cMs segment match with her on Ch2. I have lots of shared matches with her on Gedmatch and MyHeritage. Most of the shared matches triangulate on Ch2. I have contacted some of them but most have no known Irish ancestors. According to my 100cMs match, her only Irish ancestor was already in the US by late 1700s. The strong match would appear to rule out a match with an ancestor of over 250 yrs ago but maybe not? Or could she have another Irish ancestor that she doesn't know about, NPE or could it be a false match? Any ideas?