Finding godparents can be difficult. For me, fortunately, I chose my godfather because he, like this woman you mentioned, took me under his wing, helped me along in the faith, was consistently also a friend to me, brought me into his family, more or less. We are very different, though, he and I. Our relationship, however, has never caused us to butt heads, but he has always been there for me as a spiritual counselor. If you feel that you cannot confide in this woman as a spiritual counsleor, then I would suggest asking your priest for insight. I've also found that sometimes people have godparents chosen for them by their priest or a senior member of the congregation.
You should also not feel that if you do not choose this person as a godparent, that you are insulting them. Being a godparent is not a right. No one should feel that they are entitled to it so, hopefully, this woman, if you decide to choose another godparent, will not see it negatively. Still, consult with your priest and do it soon. Holy SAturday will be here soon. God keep you during your journey and welcome to the fullness of the faith in the Holy Orthodox Church of Christ our Lord.