B737-400 FA'S REPORTED STRONG CHEMICAL ODOR ON DESCENT. AFTER LNDG; ONE FA WAS TAKEN TO HOSPITAL.

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AT 10000 FT C FLT ATTENDANT AND A FLT ATTENDANT WERE STANDING AT THE FORWARD JUMPSEAT. AFTER MAKING THE ANNOUNCEMENT TO GET THE CABIN READY FOR LNDG C FLT ATTENDANT NOTICED A STRONG ODOR IN FIRST CLASS CABIN. FIRST CLASS PAX WERE ALSO NOTICING STRONG SMELL. C FLT ATTENDANT CAME BACK TO MID CABIN TO GET THE B FLT ATTENDANT TO COME FORWARD AND TRY AND HELP IDENT THE ODOR. SMELL WAS NOT THE 'DIRTY SOCKS' BUT A MORE CHEMICAL TOXIC SMELL. ACFT LANDED IN ZZZ; AND IMMEDIATELY WE OPENED ALL DOORS TO CLR OUT THE SMELL. AFTER PAX DEPLANED; IT BECAME OBVIOUS THAT A FLT ATTENDANT WAS HAVING DIFFICULTY (CONFUSED; TWITCHING FINGERS AND HANDS; EYES NOT FOCUSING; UNABLE TO FOLLOW CONVERSATION; FELT A KNOT IN HER THROAT AND OTHER SYMPTOMS) AND C FLT ATTENDANT HAD A SLIGHT HEADACHE AND WAS LOOPY. WE WERE UNABLE TO GET THROUGH TO MEDLINK; SO THE SUPVR CALLED PARAMEDICS AND THEY RECOMMENDED A FLT ATTENDANT GO TO THE HOSPITAL AND SAID SHE WAS IN NO CONDITION TO CONTINUE WORKING. THE COCKPIT CREW ALSO SMELLED THE ODOR; THEY SAID IT STARTED AT THE TOP OF DSCNT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THAT THE SOURCE OF THE FUMES WAS UNKNOWN AND SHE WAS NOT INFORMED OF THE CAUSE. THE FIRST CLASS FA WAS RELEASED FROM THE HOSPITAL AND IS BACK ON THE JOB.