You didn't answer some of the questions I asked, so that doesn't help.
We're suspicious that she swindled or coerced the decedent into putting $150,000 into a bank account ITF the name of the Executrix
It appears the residual legatee is suspicious because they are suing the Executrix.
As I wrote previously, the only person with standing to recover assets transferred by the deceased prior to death is the estate itself, which must act through the executor. If the pre-death transfer was to the person who is now the executor, that creates an obvious conflict of interest, so the preliminary step is to seek to have the executor removed so that a new executor can be appointed who will pursue the claim.
Would it be a good idea to send an email to the attorney that handled the old lady's will and ask "what are the grounds for which THE CHURCH is suing?" and mention that we know the name of the law firm that represents the church?
If there's a lawsuit, it's a matter of public record, so I don't really understand why you seem to think knowing the name of the law firm is important. And, of course, if you want to know about the details of the lawsuit, you can go to the court clerk's office and request to view the file.
As far as the question, would it be a good idea for WHO to "send an email to the attorney that handled the old lady's will"? Are you asking if YOU should send such an e-mail? Why would you think this attorney would have the slightest idea why the church is suing? Just because the attorney "handled the . . . will" doesn't mean he is involved in the proceedings to administer the estate or knows anything about the lawsuit. Is he in fact involved with the estate? If so, in what capacity is he involved? Does he represent the executor?
We were all promised a certain amount of money.
Are you referring to a promise that the deceased made while she was alive? If so, such promises are legally meaningless. Or are you talking about what the will says? I can make a will that purports to leave a million dollars each to my 4 siblings and the balance of my estate to a charity. However, if don't have more than $4M when I die, it is meaningless that my will purports to leave my siblings $1M each or that I designated a charity to receive the residue.