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As they are garnishing wages they must have filed a lawsuit and obtained a judgment. If you were not served with the lawsuit, look into a motion...

Yes, if you lose the case the court can decide to add court filing and service costs.

You will have to pay but they should be reasonable in a payment plan.

They are prosecuting the violation against the other driver and want you to testify. You likely have nothing to be concerned of but a consultation...

It is a matter of what the attorney and client agree to on retention. The fee agreement might provide some information.

Discuss your concerns with the District Attorney who prosecuted the case.

You can’t. You can withdraw for future loans. You can sue her for what you have to pay.

More information is needed to provide an analysis. Note, a power of attorney is invalid on death.

Yes. Debts may be sold. Debt is an asset of the bankruptcy estate and can be sold by the trustee.