Sister wiped out mother’s money while she was alive & living with me as caregiver. Is that legal? Her name on account only to pay bills.

Thank you very much for your advice. No one had POA over my beautiful mother. Every time I asked checkbook Darlene for money To care for her, she said mom had none, she’s broke, I did get a 3 month statement from her bank showing her checking $11,000.00& savings, which mom did not know she had, at $45,000.00. Checkbook Darlene had all bank statements sent to her house. I took mom back to the bank about 7 months later to discover My mother’s had only $1,000.00 in checking, and less than $4,000.00 in savings. I took awesome care of her for 20 months before she passed. I cared for her thru the 7 stages of dementia,Incotiance, and a wheelchair. It was 24/7 care by myself. Her will stated all 4 daughters as co-representatives. That’s fine,But she needs to repay her estate for what she stole. Any suggestions.