My mom forced me to sign an indemnity agreement?

The item that stands out the most is that you say your mother "forced" you to sign the agreement. You should never feel forced to sign such doents. She may have "guilted" you to sign it, or intimidated you, but from here on, set your face like flint and don't let anyone force you to sign anything. If you don't want to say, "no", tell the person that you need a few days to consult with a professional, then don't answer your phone. If her business fails, you really will be FORCED to pay. Get that nullified ASAP and find a new mom. Claim you never heard of this woman.