JPMorgan Chase review: bank tellers' negligence

My mom is a 80 y/o Chinese immigrant (now US citizen) who does not speak English. She got a threatening call from a stranger that there is a claim against her from the immigration office and they wants to make sure her savings are legit and she needs to wire the money to Hong Kong Bank or she will got to jail. My mom was in such a panic that she went to the bank and wired over 80K on 3/26/18 and then got a call from the same guy stating that they did not receive the wire and she wired an additional nearly $60K on 3/27/18. Chase was definitely negligent by not questioning an 80 y/o lady about suspicious activities to prevent fraud. She had two different teller and non one tried to stop the fraudulent activities. They did not even question her as to why she was sending such large amounts to money abroad. That's her life saving! She is devastated.