Definitely some handwork on the negative with pencil there. It was standard to smooth out any lines on the face and neck, retouch any blemishes, and bring up the values on the cheekbones a bit, enhancing the lighting from the skylight that is visible in the catchlights in her eyes. It was also common to lighten the irises, but I don't think that was done here.
Albumen was common for cabinet cards from the 1870s-90s, but would be fairly unusual for the 1920s, and is usually identifiable as a print on thin paper mounted to heavier cardstock, which isn't this.