Daron, have you tried fly spraying her just before milking? If you're not worried about chemicals Bronco is cheap and works well and you can pick it up right at your local TSC. If you would want something more natural I really like DEO lotion. It's not actually a lotion, that's just the name. You can buy it online through many of the tack/horse supply places. It's all natural and works really well. So well, in fact, I often use it on the humans, too.
Everything is extra bad here this year, too -- bugs, birds, coons, voles, mice... even the yotes are coming closer than they normally do this year.
you could try the fly wipes (or flyspray on a rag) to avoid getting it on her udder, too - that might cut down on potential milk contamination.