Unless I am missing something, she does not appear in any version of the arc, but the person put in no information that would explain that, the voice actor was misspelled--and she is not in the anime!--so I removed it all and asked the user to clarify.
I think this is just a mixing Higurashi with Umineko mistake.
FYI: This person http://whentheycry.wikia.com/wiki/User:Snoritha_Maka_. keeps adding often redundant details in Spanish. I wrote on his/her/not-sure-but-will-not-be-confined-by-your-hegemony to ask that additions be in English. I even offered to translate/correct such if he/she/whatever is uncomfortable writing in English.
"But answer there came none."
So after about the tenth reversion, with polite reminder to write in English, I am just going to roll them back. I can read Spanish, and all thus are are repetitions of what is in the info box or someplace else in the article or, in one case, completely wrong.