Make sure she finds a form of cardio she likes, i find if you can help indentify one then weight loss is 100x easier! learning to love to row, bike or stair climb can be pretty tough, and leads to failure often IMO.
If she would consider doing weights (once assured she won't become like arnie) then thats perfect, i find the best way to motivate this is to say "You'll be able to eat more if you lift weights" - They're soon benching
Diet wise - A bodybuilding diet is probably not ideal since its awkward and gets in the way of things (Eating every 3 hours is hassle for most). So cut out the junk(Crisps, chips, biscuits, jam) and increase veggie intake and have fruit as a daily desert to help get that 5 a day. Avoid high GI carbs, so switch to wholegrain rice/pasta/bread - Although bread isnt very satisfying IMO and i'd rather have a chicken salad than a chicken sandwich.
If she follows that i think she may see some nice results, also means she won't be calorie counting. This is all vauge simply because i think most people need 'easy' diets that they can maintain for a long period of time, losing weight with the hassle or thoughts of "whats my next meal?".
Eating regularly, drinking often and not being lazy all helps. Walk to get that daily paper, dont drive.
Alternatively, take up the bb'ers diet - Her choice i guess. Good luck to her!
P.s. EAT BREAKFAST!!!!