
Guest breding Pekes is a very specialised subject. A lot of research should be done first. Your bitch should have passed any breed specific health screning, and be independantly assessed as to her quality to be bred from. Has she done well at shows? Her breeder if expereinced would be the best person to start you off on your research, ahd may be able to advise which dogs and their lines will be compatible.
This is a breed that often needs a C section to give birth, and I gather that some do not make very good mothers, and this you won't know until the time. You could be very out of pocket with no puppies at the end of it. If you like your bitch so much it may be better to go back to her breeder or the owner of her sire for a related puppy.