Financial Elder abuse

r/

Location: Ontario

My grandma was diagnosed with dementia about 2 years ago and we’ve taken the appropriate steps for her but in the process we discovered my aunt had been stealing from her probably her entire adult life. She also hasn’t stopped to this day. As her dementia grows increasingly worse every week she drives into the city and drives my 90 something year old grandmother to the bank and has her withdraw hundreds. Weekly.
My grandmother has her cards taken away and my aunt’s power of attorney taken away but this doesn’t stop her driving in and coercing her mother every week. Unfortunately we can’t afford a caregiver to be with her all day and we don’t live with her although we live very close by.
Today we got a call from the lawyer saying my aunt drove all the way to him with my grandma and they both had him change her power of attorney back. The lawyer did it but was also legally obligated to notify my mother who was understanding enraged because her mother (my grandmother) has a doctors diagnosis and note saying she has dementia and can’t be repsonible for her money.
I don’t know how any of this is legal and how my aunt has found these loopholes and how we are supposed to protect or grandma. My aunt is a drug addict with two mortgages on her house who will drain her dry. What do we do.