If you want to drop 10 lbs, I recommend this method: http://www.menshealth.com/mhlists/sculpt_rock_hard_abs/index.php I've been trying it myself for about a month, and I've dropped down from 190 to 185 (I'm a 25-year-old 5'10" male) -- and best of all, I actually <I>see</I> and <I>feel</I> the fat disappearing and being replaced with muscle.
If you really want an answer to your question, let's work it out using the formulas from the method I just provided above. A 127-calorie apple is about 31 grams of carbs -- virtually no protein or carbs. A 100-calorie Kudos bar is also mostly carbs -- around 20 grams, I'll say -- with around 2 grams protein and 3 grams fat (you can get the exact number off the box). The string cheese has the best source of protein in your daily meals, at 7 grams, with 6 grams fat and 1 gram carbs. So your daily intake is basically as follows: 9 grams protein, 9 grams fat, and 52 grams carbs. Using the spreadsheet chart I made for my own calorie-counting (that does all the calculations for me), your 300-calorie intake corresponds to a person who wants to weigh 25 lbs -- and that's assuming you workout for two hours a week. It took me a month to reach my goal, so if the same holds true for you, I'd say you'd lose a little more than 2 lbs per day.
However, I don't recommend doing the 300-calorie diet. As one who's tried crash diets in the past (including the Lemonade Diet, in which you eat and drink nothing but a spicy lemonade mixture for a week or two), I can say from experience that the results are not as great as you'd think -- they work better for 400-lb behemoths who need to drastically lose weight, but not as well for people who don't need to shop at the big & tall store (when they're not tall).
Personally, I think 90 lbs is great for someone who's 5'2" (some of my ex'es were around that height, and they looked gorgeous at 90-95 lbs). But it's all about proportions: if your figure looks great, the number on the scale doesn't mean anything. However, if it's a little muffin top you want to get rid of, or thick thighs, I suggest trying the diet I've suggested as well as visiting womenshealthmag.com. Check out their exercises, and give them a try to target whatever you'd like to tighten up.
Remember, it's fat you want to lose; by undereating, your body is actually going into "starvation mode", in which it hoards fat for energy (since food/energy supply is scarce) and on top of that, it'll burn muscle and things you don't want to lose for energy.
Best of luck, and stay beautiful. :)