My female Rott tied on her 11th day. It is now a week later and she is still flagging the male. Should I separate them or let them breed again?

I have a 2 1/2 yr. old female rottweiler she tied on 02/14/06 on her 11th day, it is now 02/27/06 and she is still flagging and the male is going crazy, What should i do should i keep them apart? or let her breed again, i am afraid i missed the breeding for her. Also she bleed her entire cycle this time 22 days and when her blood started to change is when the proven male was urging to breed her which would be today.

Thank you,
Tricia