Ritsuka is, unfortunately, still quite new, and missing quite a few pieces of information. She may try her best, but she just doesn't have that high level a skill in information gathering when left to her own devices.

"Yeah, I just got here... A week or two ago, I guess?"

You have to understand though, by her standards, that's a long time with little to nothing to show for it. She may be pushing herself a little.