@coldb7 Well, if she's familiar with isekai stories herself she may have noticed a recurring theme. Appraisals can give you incorrect information, either because of some way to trick the system into showing different data than it should, or because of stuff like subjective interpretations. I just read something the other day that was using the tabletop RPG style alignments, and the MC saw this guy was "lawful good," so he trusted him immediately. Since that guy could sense an "evil" goddess's influence on the MC, it was considered "good" to lure him somewhere secluded and try to murder him as a heretic.
The skill she asked for instead was probably for unbiased and more in depth scientific information about stuff. Instead of appraising water and getting something like "Water (polluted)" perhaps she'll get stuff like the chemical compounds that are specifically polluting it, and then can use that other skill she asked for to alter them.