@KrayzikkI was actually wondering about that. Nidhogg has a magic that is like Take-over, but the way I explained it makes it seem more like an ability that comes to his body naturally(or unnaturally as the case maybe) than having it actually be a magic. Do you think something like that would be affected? Also, what happens to things created or manipulated by magic, but are not inherently magical in nature nor needing to be supplied with magic to stay manifested, such as creating a long sword, or just simple requip. Would her anti-magic banish such items or simple not effect them?
One of these was asked earlier, thanks Onarax, so I'll cover that one first. An item created or summoned, like Requip or Ice Make magic, will continue to exist within her field. Summoning or making them, on the other hand, will be affected. A spear summoned using Requip magic outside her influence would continue to exist inside her influence, for example. But it couldn't be summoned (or would be incredibly difficult to, depending on proximity) within her field.
On the first point... If it's not something that a species could do naturally, and it isn't explicitly something other than Magic, I'd say it would be affected.