Dungeon monsters actually copy abilities just by seeing them. Looks like Shiro has to improve her stealth like ways and just yesterday I thought that Shiro should use her soul abilities and maybe a new martial art.
Maybe one of the dungeon rewards is similar to copying abilities.
If you are familiar with Toika novels, in infinitely competitive novel, there was a species called book readers with the same power... Copy everything they see, share it and become immune against it..