Diet and exercises changes; not losing any weight, help?

Hi over that past couple of months I've seriously changed my diet to eating less and eating healthier because I was eating junk food and consuming too many calories last year. I also hardly ever worked out last year and when I did it was maybe once or twice a week at most for 30-45 minutes. For the past couple of months I've gotten to running for at least an hour 5 days a week, eating around 1100 or 1200 calories per day, and not drinking soda. Yet, I haven't lost any weight. I feel healthier, and my old jeans fit me now, which were just a little snug before, but I haven't lost any weight. I was thinking maybe it's muscle mass but still, shouldn't I be losing a little? My calorie counter app keeps predicting me to be losing a significant amount (I know 1-2 pounds a week is a good goal). I'm also a 5'11", 18 year old female if that makes a difference. My diet consists mostly of chicken caesar salads, tuna salad whole wheat tomato sandwiches, special k cereal, water, and sobe lifewater or lean tea. I do eat other meals sometimes, but usually have at least one of those for lunch or dinner every day.
I also don't get much Caesar dressing, to add to that. I eat 2 solid meals a day and a little Special K or granola bar here and there otherwise. I mean I'm not gaining weight, but I'm not losing it. And I've also always fluctuated like a lot. Like in a 10 pound window. Thanks for the help, guys.
Alsooooo, I work out at night mostly (sometime between 8pm and 11pm), but I'm usually up until around 2am anyways and sometimes have a small meal after I work out and still significantly before I go to bed.

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Recommended Answer:
By the looks of it you are not eating enough. Contrary to popular belief you need to eat more, not necessarily less.

Are you monitoring your portion size? Eating a health balance of fruits, veggies, whole grains, and dairy? Chicken Caesar salads are still loaded with a fatty dressing and Sobe life waters still have bad sugar in them. You need to have a healthy combination of grains, dairy, fruit/veggies and protein at every meal, preferably 5-6 times a day. With 5 day a week workouts your body has likely gone into starvation mode and turned your metabolism to s**t. Increase the calories to at least 1,500 a day and you might start seeing a difference.

• Try doing a regular planned out exercise schedule and do not change it up at all and do it for 30 days I recommend the cheer athletics workout and diet. It works well for them and me as well