You may be right that you're eating too few calories. Without seeing what you're eating, it's hard to tell. Take your journal to your coach for review.
My coach has occasionally told me that the body can get complacent with same old, same old. It needs a change up - calorie confusion, she calls it. So sure, add an extra packet, see if that shakes things up for you. I know that quite often if I have some extra fat (chicken thighs, nice steak, prime rib) - I have a loss. Some people have tried switching lunch and dinner around, you could try that. Also, water is really important, make sure you are getting it all in, even add some extra water.
Are you a tiny person? I noticed your goal weight is fairly low unless you are quite short. Is it realistic? Maybe your body wants to stop where it is
Good luck!