CABIN ATTENDANT BECAME ILL DUE TO LACK OF OXYGEN.

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WE WERE COMPLETING THE LAST SEGMENT ON A 4 LEG DAY. THE ACFT HAD A WRITE-UP CONCERNING A NOISY MAIN CABIN DOOR (SQUEAL UNDER PRESSURE STATION DUE TO A BAD DOOR SEAL). THE ITEM WAS DEFERRED AND RELEASED BY OUR MAINT. AFTER THE FIRST LEG; THE FLT ATTENDANT COMPLAINED THAT THE NOISE WAS TOO MUCH; AND SOME PAX HAD COMPLAINED TOO. UPON ARR AT OUR HUB; MAINT CLEANED AND SECURED THE SEAL IN AN EFFORT TO REMEDY THE NOISE PROB. AS THIS DID NOT FIX THE NOISE; THE ONLY OTHER OPTION WAS TO OPERATE UNPRESSURIZED. MAINT DEACTIVATED THE PRESSURIZATION; MADE THE APPROPRIATE SIGN OFFS; AND WE WERE ON OUR WAY. THIS WAS NOT WITHOUT A LENGTHY DELAY AND THE CANCELLATION OF ONE OF THE INTERMEDIATE REVENUE LEGS. THE FLT ATTENDANT WAS FEELING BAD ABOUT THE INCONVENIENCE BEING CAUSED; AND NO DOUBT SHE MUST HAVE BEEN A BIT STRESSED. THE CAPT BRIEFED HER ON THE PHYSIOLOGICAL EFFECTS OF UNPRESSURIZED FLT (SHE IS ALSO A SMOKER); AND SHE WAS OK WITH IT. WE DEPARTED FOR ROC. THE ALT WAS 10000 FT; THE MAX ALT FOR UNPRESSURIZED. 1/2 WAY THROUGH THE FLT SHE CALLED THE COCKPIT TO SEE IF WE NEEDED ANYTHING (TO EAT OR DRINK). SHE SEEMED FINE. ABOUT 20 MINS OUT OF ROC; SHE CALLED; GASPING; SAYING SHE 'COULDN'T BREATH AND COULDN'T GET THE BRACKET OFF' (THE OXYGEN BOTTLE). THE CAPT IMMEDIATELY BOLTED BACK; INSTRUCTING ME TO CALL FOR MEDICAL ASSISTANCE. WE LANDED. SHE WAS TAKEN OFF AND ADMINISTERED OXYGEN AND REFUSED FURTHER ATTN. THE FLT ATTENDANT (AND THE PLTS) WERE TAKEN QUITE UNAWARE BY THIS OCCURRENCE. EVEN KNOWING ABOUT THE PHYSIOLOGICAL EFFECTS WAS NOT ADEQUATE. PERHAPS EMPHASIS SHOULD BE GREATER IN TRAINING; AND EMPHASIZE THE EFFECTS ON SMOKERS. WHEN THE CAPT WAS ASSISTING HER; HE WASN'T SURE IF THE OXYGEN WAS FLOWING PROPERLY. (IT WAS; BUT DUE TO THE FLT ATTENDANT'S PANICKED STATE; ITS EFFECT WAS DIMINISHED.) WE'RE ALL TRAINED ON THE WHERE'S AND HOW'S OF EMER EQUIP; BUT PERHAPS A LITTLE MORE 'HANDS ON' OP WOULD BE IN ORDER.