when it comes to colourblindness the SE developers are NOTED highly for FFXIV's colourblind friendliness, when it comes to ones that can't be avoided due to a more common colourblind scope or one with a much bigger demographic attached, they tend to use patterns to differentiate.

so if she is unable to see AOE markers is she not seeing what should look to her as a circle that is pulsing. or a line pulsing ect. when it comes to fights that use teachers (with the exception of t11) all coloured chains have a different pattern to them some thick and others dotted. then this boils down to communication, as the average player is going to should out green. which is natural to them. not thick or dotted. aka, your friend will have to adapt as much as she can, or she will have to change some settings on her computer screen to assist for now, until SE dose decide to make multi colourblindness friendly modes. (which they tend to do with every major patches, so 'keep your eyes pointed heavenward' they might be ahead of this and have something for differently abled people. :3