Yes, I agree she doesn't need to hire a lawyer, she just need to pay for notarized affidavit of loss which she can do by going to any public notary in Butuan. And yes, her passport is not needed for initial filing of I-129F.
3-5days passport processing is all in the past... well maybe in manila but in the provinces regular processing takes over a month now even for renewal. express processing is 12 working days (not counting saturday and sundays and all holidays), regular processing is 24 working days. But it took more than 24 working days to get my passport since I applied for renewal Jan. 14 and got my passport 1st week of march. Well, they just started using the new system when I applied. I guess by now, the processing times have been stabilized and DFA cagayan de oro might just be more efficient than DFA Davao. Here's the link for DFA Cagayan de Oro:
http://rcocdo.philcom.ph/release.htm.
You are from Louisiana so you will be filing with vermont service center. Though your fiancee's passport is not needed for initial filing, I would strongly suggest that she get it the soonest. VSC could approve petition in less than a month, though it could also take several months (some cases from August are still pending) but there was a number of people who got their approval in less than a month (the fastest was 17 or 18 days after filing) and who knows you could be one of those lucky super fast approval. It is better to be prepared way in advance than to wait till the last hours.
We sent off our I-129F petition application Jan. 29. We assumed our approval would come by May or June and then interview would be june-august so we took some time off and didn't prepare for the next part yet (though i did apply for passport even before we filed). But ALAS we got approved march 18, just 49 days after filing and then 2weeks after, our papers was already with US embassy Manila. When we called for interview appointment last Tuesday, April 1, we were given the option to have interview by April 9 (maybe there were people who back out from interview sched and freed some slot for that day) , just one week after calling. It would have been wonderful if we were prepared but since we are just starting with the needed paperworks for interview, we had to decline the april 9 offer and choose a date in May instead.
So do expect the worst but hope for the best and prepare everything the soonest coz you never know when luck would knock. Good luck and God speed.