Alcohol or Medical Problem help?

The other day my auntie who lives in Devon, England is a buisness women and when she was in a meeting for 2 hours she was feeling dizzy the whole time and after the meeting she came out feeling drunk. She drinks Tenants Super 9.0 vol can of larger x2 nearly everyday and she is really keen to stop and she has stopeed for a week now. She also says that she is craving sugar from busicuits etc. So can you tell me what if the diizzines was from the beer or something else? she doesnt smoke and she is healthy appart from suffering with her back. She isnt an alcholic because an alcholic drinks any bevrage all day long. But why is she gettin this and can you give me some great advice? really appraicate it. Oh also do you know how long it will take her to compelety give the beer up and to not get the addiction.. how long does it take for the cravings to stop. THankyou....