
my only experience of prolonged bleeding after matings i am afraid resulted in the same bitch missing twice, she did bleed a little long on our third and final attempt and again i thought she had missed and resided myself to the fact that i was never to have puppies from her and the last fortnight she has grown and is due now much to my amazement - just keep a close eye on her for anything that seems unusual for her as my girl went off her food at about 4 weeks post mating and did develop pyo, so just be vigilant
I hope all is well and you are successful with her - good luck