I know the answer is probably not satisfying, but does this really need to be an isekai? I mean, the girl just lost. No need to use her super useful Japanese leet gamer skills here. Just be a nun and chill out until she's the one somehow drowning in men.
Having said that, to this day I still wonder why I tend to tolerate shoujo isekai better than shounen. Now I feel like I'd drop anything the second I see a stats window.