Getting financial details. How can we get details about all of her accounts and make sure they are being managed appropriately?

I had POA for my mother with dementia, then one of her granddaughters traveled to our state, took mom to her bank and had her sign POA over to her. (Mom had no idea that she even went to the bank). I'm sure what the granddaughter did was illegal as I was not even informed of it.
The last laugh was on my granddaughter because the only money in mom's account was her monthly social security & veterans benefits. Those monies were already being paid to this granddaughter's biological mother, who was my mom's caregiver. She thought she was going to hit the jackpot with granny, but she was sorely mistaken!

Is there a POA?
If yes, can you get them involved?
My thoughts are to hire an elder care attorney. If mom has money you could be reimbursed. If nothing else an elder care attorney maybe able to at least make sure money is not being used to take care of the girl instead of taking care of mom.