You feed your monitor, you feed it based on your goals, and of course its goals. You say you have a female, under normal temps(for it) It will feed and grow, then it will feed until it builds(stores) the energy it needs to reproduce. Then it will use all energy to continue to reproduce. That is their design. That is what they do.
If an individual gets fat, you then try to figure out why. The Why is not always because it feeds to much, but in most cases, one or more other poor husbandry conditions cause it to get fat. For instance, if its warm enough to feed, but not warm enough to use its energy for growth and reproduction(takes X amount of heat plus energy) It will then store the energy as fat. That fat is suppose to be used when the weather heats up again. Only in captivity, the keepers forget to heat it up again. So they get obesely fat.
Of if you feed a poor diet, like turkey, turkey is not a normal balanced prey item, its a partial food. These predators are designed to consume whole prey items. When you offer parts of a prey item, the monitor can and do store it as fat, instead of using it. Again waiting to gain the needed balance at a future date. Of course it can be done, but if your here asking these questions, your not ready to feed convienent foods, feed whole items, until understand whats needed and when.
If you feed an unbalanced diet, you again can influence whether your monitor gets fat or grows and reproduces.
Now what to look for. If your monitor is not progressing how YOU want it too. Remember we all have different ideas of what fat is. You make adjustments to fit what YOU want.
For instance, I have looked inside enough monitors to fully understand, that even a skinny monitor has lots and lots of fat. A normal appearing monitor in most folks eyes, has lots and lots of fat. Maybe 25% of its total weight. A fat appearing monitor, the fat will indeed outweight the monitor. If you do not believe me, find a dead fat monitor and cut it open, the amount of fat will indeed scare you.
Also consider, monitors do not use the same schedule as keepers. In fact, the most commonly kept monitors(african) are normally boom and bust. That is, they eat like pigs in the wet, and starve in the dry. Remember, their season of non feeding, IS THE HOTTEST. as in, not winter. Of course they do not quit feeding if they find suitable areas, like rivers(niles) or farmlands. Then they continue to feed and produce even more and faster. So, feeding every three days, four days, everyother day, once a week, is totally silly. They have no idea what that means. To them it means, theres not enough food so they convert it to fat. Then conserve energy. In simple terms, its a deadend method.
Your job as a MONITOR keeper is to make decisions, not follow guidelines. This is why the monitor world is so backwards, they do not want to make decisions. None of this is hard or critical, unless you wait WAY TO LONG. If its getting fat, adjust to your goals. If its skinny, feed it. If its hungry, feed it, unless its exceeded your goals. If you starve it for a purpose, its not the same as starving it out of ignorance. By the way, monitors are genius at not loosing weight. hahahahahahahahaha.
So, if you want to act in a smart way, feed only whole food items. If you want to see your monitor act smart give it a wide range of conditions and watch it make its own decisions.
When you do that, it makes your decisions, little tiny ones. It actually turns you into a servant, you task becomes only providing things, not making important decisions. Remember, the monitors are happy to make them for you. You just need to allow it. Cheers