If you want to eat more, I think your only alternative is either more cardio
(I'd suggest some NON-IMPACT) or some serious weight training. Even through you are happy with the way your body looks now, muscle really is your friend. Weight training is NOT going to turn you into a muscle-bound she-man. If it were that easy, we'd all look ripped and have a six pack.
You
should be able to eat more, but we are all an experiment of one. I maintain on about 1400 calories with heavy weight training 4 days a week and cardio 4-5 days a week. I lose on about 1250. I'm about your goal weight, 5'2" and a 1/2 and 52 years old. I suspect you're a lot younger which should work in your favor.
On the other hand, be glad that you aren't hungry! I'm always starving!
Another thought- what types of foods are you eating?
Mel