Hi Goof
If we answered the question in your opening post - it would mean we would be publishing the name of a known living person which as you are already aware from your previous posts is forbidden by RC to protect their privacy.
Previous posts indicate you are aware this person is alive as you have confirmed it with her late sister's husband who is no longer answering your emails.
Whilst we all appreciate this must be very frustrating for you - you cannot keep asking for lookups for this person as you will continue to get the same response.
I seem to recall you mentioning that you were in the process of arranging contact with her via her brother in law when your emails started to be ignored. This could possibly be an indication that she does not want to make contact & you may have to accept that.
If that is the case - it would have been polite if the brother in law had conveyed that info to you so you know the situation.