Based upon your summary of the charges lodged against your sister by the State, at least one of them is probably a felony, meaning she could possibly be sent to prison. Damages resulting from intentional conduct are not covered by insurance, so unless your sister has enough assets to pay a damage judgment, it may not be easy to find a lawyer willing to handle a civil case for you. Since the attack occurred after leaving the bar, it seems like the claim you hope to pursue against the bar would be that they over-served her, but you do not provide any specific facts that would support that claim. While such a claim is possible, it seems like a difficult one under the circumstances you describe. You should contact the District Attorney's office in the county where she is charged, and ask to speak to the victim/witness coordinator. You can express your desire that your sister not serve time, and request restitution for any medical expense, property damage, lost wages, or other special damages as part of the criminal prosecution. General damages, like pain and suffering, are not available under the restitution statute. In Brown County, the DA's office can be reached at (920) 448-4190.
This answer is provided for general information only. No legal advice can be given without a consult as to the specifics of the case.