cheque bounce case against old widow lady

Old lady aged about 70 years. case filed against her with someone, whom she don't know under NI 138. Case was: Her nephew took to to bank and opened a account in a bank, near to his home. then he requested to her, he needs cheque for security. she did it on good faith and goodwill she sign 04 blank cheques. all the cheques given to him, was used by someone whom she don't know. now they are asking to pay huge some of amount as she is a guarantor. Case was filed under NI Act 138. she is old and heart patient. Is at the time of appearance in court, she needs surety? as she is living on her old age pension, which is 1K per month. or her daughter, who is living in other state can give her surety on vehicle registered in other state? please send reply asap possible.