The lady's name is Bayla - which makes sense as her name is Betsy. I have asked my husband who is a not only Israeli, but also very learned in Jewish law, for his opinion of the name. He says it is Itsik, which is also Yitzchak (Isaac)which is good news for you. However, the next bit reads son of Avraham Avinu. He confirmed that this is normally the name given to a convert. The only other reason it would be used is if the party writing the gravestone did not know Itsik's father's name, they would write AA, as the father of all Jews. Hope this helps