The glamour spell will turn the witch completely normal. What "normal" is exactly depends on the observer. The enchantment means that if the witch is fay-blooded or even a full on fay, they will look and sound like a kykr to the kykr. No matter what inspections the onlooker will do, including physical touch, they will not find anything odd with the witch. It does not, however, charm the onlooker in any way. They will behave just as if you were just another commoner on the street.
However, the glamour will leave a greenish aura shimmering around the caster if exposed to sanctified ground (
Sanctify Rune) or when near a sufficiently strong sanctified item (
Greater Sanctify Rune). It will not reveal the true nature of the caster, but the spell itself can then be seen.