This is the issue I have with some people saying ‘Just love her and accept her’. Of course the mother will love her daughter, but isn’t part of that love for one another to help each other get to heaven? Sin pushes us away from this destiny.
I understand this is a difficult issue, and I understand that the daughter was very emotional and probably building up to telling her mother this for some time. Of course she needs comfort and reassurance that her mother will not stop loving her because of this. I’m just saying though, love for a fellow human being is telling them when they do something (or could do something) that will push them further from God.