By liability I mean if any mistakes are made they absorb that liability of mistakes.

They will 100% be responsible if they screw up your tax returns, and that costs you money.

Add proven by the fact she was able to sue. You don't have to sign your rights away. And I would suggest that if any one of them does ask you to sign away their mistakes as a rate you go find another accounting.

My accountant here and the one that I've had previously they've always guaranteed their work.