My lawyer is not following through on my case as she says she will. Would another attorney take my case?

What should I do if I feel my case is getting hardly any input from my attorney and it is going on 2 years since my stepfather died. I have to call and email several times to get a response or follow up and 85% of that is excuses of how she meant to get back to me but got busy with CLIENTS. I hired her and I have paid her every nickel charged..does that not make me a CLIENT? My half sister has broken the law and abused her position as personal representative horribly. It has cost me and the other 3 beneficiaries thousands of dollars. I had a heart attack last Feb over the stress of this. I just want to know if I have a solid case against her in court or if I need to just let this go and save my sanity.