WHERE WAS SHE HIDING THAT SCYTHE? Ain't no way people saw her with that, covered or not, and thought "Yep, just a cute girl with a scythe. Nothing strange here."
She doesn't need to hide it at all in that world. There's even a skill that gives scythes bonus damage.
The party does stand out but for a different reason. In the novel Shiro explain that there are 2 reason why they rush to Inns as soon as possible the moment they reach a new town.
1) Due to Shiro's albinism, she's weak to the sunlight
2) Weird rumours about the party members (Merazophis in particular)
Remember, the party is made almost entirely by women and even worst almost all of them look like little girls. 90% of the time people think that they're Mera's harem... The other 10% they think that Shiro is Mera's wife and the rest are their childs.
Again skipped content. Due to Shiro's motion sickness usually Mera
pricess carry her to their inn room