What is a good weight?

According to

link

a healthy weight for a woman that is 5'4...

small frame: between 114-127

medium frame: 124-138

large frame: 134-151

however... I don;t pay as much attention to the scale as I do my body. Do I feel lazy and tired all the time? chances are I'm out of shape. Do I feel more confident and energized throughout the day? Usually means I've been going to the gym several times a week. Don't compare ourself to others either. You know what your body looks like when you are healthy and physically fit, and that doesn't mirror a girl who's in a bathing suit ad.

the key is eating relatively healthy, exercising and doing cardio at least 5 times a week to feeling and looking your best

It really depends. I have a friend about that height and she looks great weighing 140. I'm a couple inches taller and when I got up to that I looked heavy (I'm usually close to 120). She works out more than me so I think it was because her muscle weighed more than my fat.