Who is this saint? Pt. 2

Can you identify this saint?

This saint at least convinced my mother she is a saint, but beyond that I have no idea as to her identity. Because there appear to be pyramids in the background, for a second I thought of St. Catherine of Alexandria, but that was very clearly incorrect. St. Catherine wasn't a nun (and this image doesn't include any of St. Catherine's attributes, not even her Catherine wheel).

I'm not familiar with any other Egyptian saints (a little googling showed me St. Mary of Egypt, but it's clearly not her, either). I'm not sure who else it could be, or if I'm even correct in thinking she must be Egyptian.