Continued prayers for you.
I wonder why she is asking - if you know? That can help guide the conversation.
Others have given good answers. I will only say that I do best by (1) avoiding mentioning any denomination/comparison at all, and instead (2) focusing on what I have gained by finding such things as God truly as love, discipline that helps in overcoming temptation, prayers that truly open my eyes and heart to God, worship that brings me into the presence of heaven, deepening trust in God, and so on.
I don't mean as a list as I just wrote it. I think that tends to come off as triumphalistic. Rather I find it best if someone asks to talk about one or two things that are fitting to the conversation, and how they help me love God more fully or follow Jesus better than I did before. That kind of concrete honesty seems to reassure people that we really ARE following Christ. And/or give them a glimpse of what they can share in also, if they want it.