
Good luck with your trip, you are much braver than I am! I booked our tickets 2 days before travelling on the basis of a first progesterone test on the Friday, travelled out Sunday and arrived 1500 miles later on the Monday night. I mated the bitch that night, again the next day with a second progesterone test that evening which showed ovulation to have taken place that day, and a final mating on the Thursday morning before driving home. I had 2 dogs left in kennels while we were away so was in a hurry to get back for them and ended up paying well over the odds for an on the spot ticket home.
All this was for a bitch who has always been like clockwork. Not to put you off the plan to expose your girl to a bitch in season, but I had a bitch over from the Continent for 9 days to be mated to a dog of mine (she wasn't as ready as indicated by the first progesterone test, probably being upset by travel and change). I was terrified that she would bring my bitch into season early, but this time she was two months late.
Your other issue is (as with our Dutch visitor) your bitch may be 'set back' by the stress of travel. This bitch had previously been successfully mated on days 14 and 16; her breeder had to return home, which meant boarding her with us. She was mated here on days 19 and 21, and my vet was sceptical about success (she had a litter of 7). So with this in mind I deliberately took my oldest boy with us because he is normally her "crate companion" and they absolutely loved their holiday. Whether he had any definite impact on keeping everything as normal as possible I can't say for sure, but it seems to make sense to keep everything as normal/stress-free as possible
Our first litter is due next week and I can barely sleep for excitement :-). Hope the same comes true for you!