Executor of the will thinks it was suppose to be her that transferred everything into other persons name.

I also think anything in both names, like checking accounts, automatically go to the surviving spouse, probate has nothing to do with it. Actually, if Dads will says what is his is hers, there really isn't anything to probate. I see nothing wrong in helping Mom change things over. They did the Executor a favor.

The Executor only handles what is in the will. When it comes to making SS changes, pension changes with employer etc. that can be done for Mom with her POA. POA for Dad ended with his death.

I have no way of knowing if the transfers were handled properly BUT A will doesn’t always have to be probated. Sometimes it’s not necessary.
Remember that bank accounts, savings, life insurance, things listed with a beneficiary pass outside of a will. Trusts are outside of a will.
Co-owned assets can sometimes just require an affidavit or death certificate. If all the assets were to go to GM and that’s who got them, then probating the will wasn’t necessary. If the will isn’t probated, then the executor isn’t needed.
In some states the will can be and maybe should still be filed regardless of whether it is probated. That’s two different things.
I wonder if your mom as POA for the beneficiary (GM) was in a position where she may have needed to act to protect GMs assets?
It doesn’t sound like she did anything criminal.
On the other hand, it’s too bad the sisters couldn’t have handled this process as a team and not created hard feelings.

Wilson, I'm a bit confused. When were the transfers made? If they were made before death, and retitled, such as "Grandpa and Grandma …. with rights of survivorship", (and properly recorded), there was no need for retitling. All that had to be done was recording a deed ensuring that title would transfer automatically.

Anything not jointly held or already retitled would have been the responsibility of the Executrix aunt, hopefully with an attorney's assistance to ensure it was done properly.

And disposition of assets as well as Executor/trix choice is always the decision of the testator/testatrix, to whoever he/she wants, whether it's the local animal shelter. a charity, or family. That's a main purpose of a Will, to designate assets to whoever the individual wants to have them after his/her death and to have the Will carried out by whoever the Testator/trix wants to handle his/her assets after death.

If your mother and non/executrix aunt handled everything, I think at this point the issue is more of whether or not it was done with the assistance of an attorney and done properly. There should theoretically have been communication between the executrix aunt and your mother and other aunt, but that hasn't happened.

In retrospect, I wonder why they weren't together on who should handle, but it's water over the dam now, unless something wasn't done properly. Where was the Executrix aunt when your mother and other aunt were carrying out the bequests?

The executor should have been the person to handle the disposition of the will. Since there is a surviving spouse, in MOST cases, all money, etc goes to the surviving spouse, with perhaps just a few items specifically set aside as designated for survivors. At death, POA is null and void. Your being POA ended when grandma died. For whatever reason, grandma made someone else her executor.

Sorry, that's not what you want to hear, but talk it out and perhaps talk to the lawyer who drew up the will.

Don't let this ruin the relationship with aunt. She should have done the work, why didn't she?