Hi Melly!
You know, those calorie calculators are just estimates - not accurate for everyone, and in fact, grossly inaccurate for most people I've talked to. Not to mention that sometimes our bodies just don't agree with what the calculators say! I can have a 3500 calorie deficit on paper, but might not lose a pound, simply because my body isn't cooperating. The best way I know to figure calories for weight loss is simply to experiment...try one calorie level for a few weeks, and if you're not losing as fast as you'd like, take away 100 calories a day, or if you're losing too fast, add 100 back in...adjust as necessary.
For someone your age and size, 1100 calories might be a little too low. I know that I always work from the goal of getting to eat as many calories as I can and still lose weight at a reasonable pace. Maybe add 100 a day for the next two weeks and see how it goes scale wise?
In any case,

and settle in! I look forward to hearing more from you soon!