Nationality? Reason for being banned the last time? Important factors. Walk up to the embassy in her country, provide true details and accept the answer. Likely to be overstay + some other problem.
Always 1 group for and 1 group against. Am impressed to see Thailand drawing such a huge degree of interest ... tough to please everyone ... but they have a right to make their policies.
Call the Thai Immigration ... explain your case. Ask for name of officer talking to you. Explain thr issue with name of that person when you enter. Worked for me few years ago.