Unfortunately, you will need an attorney. The problem is, having a "power of attorney" does not make you an attorney, but only a lawyer can bring a lawsuit or legal action on behalf of anyone but him/herself--that is, nonlawyers can't bring legal actions for other people. Eviction in your state, like in most with which I am familiar, requires that a type of lawsuit called a "dispossess action" be filed to remove tenants if they won't go when you ask them to. Only an attorney can bring this legal action for another person; while you have a POA from your mother, you are not your mother. That means you can't represent her in court, but have to hire an attorney to do so.