MWG - I have a similar problem of being a bit colourblind (deuteranomaly, more specifically).
As far as I can tell, the problem with the shot is that it's far too warm.
When I loaded the shot into LR and used the Auto WB function without changing anything else it had sorted out a lot of the colour casting and made it look more "natural". Obviously I understand that the type of natural LR has given me is what I'm used to seeing and that people often warm up my skin tone too much in shot (I'm really quite pale) so maybe the shot you posted is a more accurate representation of your mum's skin tone.
Either way, if I'm struggling with colours (either balancing them or making transitions seem smooth for example) I'll opt for a mono conversion - you can get away with a lot more in black and white than you can in colour.
The following edit of your shot is just a quick playing around with the sliders after dropping saturation to -100
You may or may not like it but it might be worth bearing in mind the mono conversion for us colourblindies
I'm not advocating using mono as a cheap fix for photos but it's one to bear in mind - when I took some photos of someone the other day they wanted me to "rescue" a test shot that was 2 1/2 stops overexposed. Mono conversion and high contrast made it their favourite photo of the shoot