Visitor Visa - B2

Hi I am seeking advice or simply information on what the possibilities are for the situation that I am about to explain. My sister visited the USA and gave birth to her baby there about 1 year ago. My sister arrived 2 months prior to her due date. Our aunt stated that she would sponsor her while in the USA and she organised her insurance while she was there. The insurance however was obtained under the Medicaid system. My sister returned home as soon as she was able to travel with the baby. However my sister's visa expired shortly after she returned and when she went to renew it she stated on her from that she was travelling with her baby. When the consular officer asked about the baby's visa my sister stated that the baby has an american passport. When asked how she paid for the birth she stated that she was offered insurance when she got to the hospital as she wasn't a usa resident. The consular officer was very annoyed and stated that my sister wanted to return to the usa to further abuse the health system. I understand that the wrong thing was done. My sister was given a single entry visa for the trip she needed to make but she was unable to travel due to circumstances. She needed a visa to travel for work later last year and they gave her another single entry visa. This year she has the same work trip again but they denied her stating that she was found ineligible under Section 214(b) but the consular officer inquired about the method used to pay for the birth and whether she has attempted to make any payments in respect of same. He did not view any of the documents which she had with her which included receipts from a surgical procedure which the baby had to undergo in our home. country. I would like the most practical advise that can be rendered given the situation described. Is it likely that she will be barred from re-entering the USA or is it likely that it will be quite a while before she is granted a usa visa.