First off, congrats on the 10lbs!
Definitely bump up those calories. Going so low not only burns muscle (which lowers your metabolism, slowing weight loss) but could screw up your metabolism long-term.
I'm also short, only 4'11", and lost about 35 pounds over two years. I ate 1600-2000 calories/day and walked 3 miles/day. (I also had an active job.) The weight came off in spurts, with long plateaus. I didn't mind the plateaus though b/c my focus wasn't weight loss, but healthy living.
I then plateaued for about a year. I didn't really think of it as a plateau though because I was happy with my size. I added in strength training to tone up and lost another 5 pounds rather quickly, in less than two months.
I've never wanted to drop my calories too low because I feared that would wreak havoc on my metabolism and make me unable to lose/maintain on a calorie level that I could happily sustain.
So my advice to you would be to definitely bump up your calories. I'd go with at least 1400, do about 30 minutes of cardio 6 days a week and strength training 3 times a week too.