Guinea with an abscess

Hi, I have a guinea fowl with an abscess behind her beak and under her right eye. She's had it now for about 3 weeks! I've poked holes in it the first week and half and had her on antibiotics. I just get clear fluid and a little blood. It wouldn't stay open to drain. I finally got the guts to put a 1/2" slice in it and flush it with peroxide and water (50/50) and tried to pack it with a "shunt" so it would drain but as soon as I got her to the cage it was out! Where it is I can't get tape around it without covering her other eye or taping her mouth shut! I keep opening it and flushing but it keeps filling! Any ideas? BTW... she eats well.

Thanks!