You know Frieren is going to vent against the full conspiracy group, right? Then she'll retort "things happened, a mimic tried to swallow me and I got my money back. Ah, and the mission is completed".
Overestimating Frieren a bit much aren't we
In this very chapter we saw her asking Stark to tag along before she talked with the merchant dude
The author is making a very clear point here of how dangerous warriors (and specially shadow warriors) are to mages under certain scenarios (like for instance a surprise attack or close combat)
Remember Frieren got neg-diffed fighting against an old, semi-retired shadow warrior just before we entered this arc
Individually she's certainly stronger than any of them if given enough space between them, but I don't think she's just going there to destroy all of them and call it a day. I don't think that's what the story is going for at all, it would defeat the whole purpose of what has been built regarding the dangers warriors pose to mages in the last 10 or so chapters.