Hi SpurTort10 (sorry, I don't know your name),
That's great that your tortoise is happy and enjoying herself, but tortoises can be greedy and if they put on too much weight too quickly then it can cause serious problems with shell development. There are lots of guidelines on how much to feed a tortoise -- as much as they can eat in 20 minutes once a day; enough leaves and flowers to make a little jacket to cover their shell once a day, etc., but the best thing to do is to keep a record of their weight gain, and if they are gaining too quickly then cut down on food and if they are not gaining enough then increase it.
As a general guide tortoises should gain on average between 1g - 3g per month -- but this is only an average and some months they will gain more and some less -- but it is a guide. You can download our observation booklet that helps you with record keeping here
http://www.thetortoisetable.org.uk/tort ... measuring/ or we will have printed copies available soon
Regarding the diet you are giving her -- do you have a good care sheet for Hermanns? Here is one:
http://www.tortoise-protection-group.or ... 014New.pdf Hermanns are a Mediterranean tortoise, and those species don't cope will with natural sugars present in fruit (and tomatoes count as a fruit too), and it can upset their gut flora. Fruit won't damage them or kill them, but I wouldn't feed it deliberately. Also, cabbage is in the brassica family of plants and they contain goitrogens that can interfere with thyroid activity, and in large amounts can cause some kidney damage (small amounts of cabbage won't hurt at all, but it's probably best avoided).
You can always type the name of any plant you are feeding into the search box on our website, and see what the advice is for that plant (we have a traffic light system of coding to make it easier -- green, amber-green, and red for feed freely, feed sparingly, and don't feed). Any questions you have, just ask.
Hope that helps, and please don't hesitate to get in touch with any more questions.
Cheers,
Nina