If you think about it, it's a very clever idea having the gretel filter on most of her stories talking to camera and i have no doubt it's a decision pushed by her management.
There is no way she really feels awkward showing her face and is self conscious to the extent she portrays, if it was that bad she would never have been able to go on This Morning and photoshoots, you are unable to. By roping the viewers into believing 'little old me can't believe I'm doing this', it makes them feel attached and see themselves in her when really (not trying to sound rude) the vast majority of them will be overweight/frumpy or neglecting themselves due to depression, a new baby or just how they are. They get to live vicariously through her, and by making out she struggles with anxiety, it stops the jealousy some of them may feel.
This then brings me to the bloody old woman filter. As she is not a trained actress, i imagine her and her management worry about her body language, voice inflections and micro expressions giving her away. So this stupid filter not only fits in with my above point, but also provides a lovely cover for her manipulation, killing two birds with one stone.