Absent Bridesmaid

I asked my bridesmaids last year. All said yes, however, one has ghosted me now for several months. Me and the other bridesmaids have reached out numerous times, through numerous platforms and people to see if she is okay, met up which she has been invited to (including coming dress shopping) but she has ignored us all. No one can get through to her but we can all see she is active in social media. How do I tell her I feel like I no longer want her as a bridesmaid and be nice about it as I feel like myself and the other bridesmaids cannot rely on her and she has made it apparent she doesn't want to be involved?