Snakes all grow at a different rate and you are feeding her on an appropriate schedule, so I wouldn't worry about how big she is. You might actually be feeding her a little much, depending on how big your fuzzies are, so it doesn't look like underfeeding is the cause of her size. It doesn't matter if you give her one hopper/weaned or 2-3 fuzzies, as the amount of food is the same. If fuzzies is what you have, it's fine to use them up. In fact, it's probably better to feed several smaller items instead of one larger item, but it's usually cheaper to feed one item.