How to lose stubborn belly fat

I have successfully get to my target weight: 5'4" and I weigh 110 lbs. after gaining too much during my pregnancy. My pre-pregnant weight was around 48 kgs and my pregnancy weight reached 65 kg. Right after giving birth, I weighed 57 kgs and for so many reasons, which I think I do not need to enumerate since they are just all excuses , I gained back to 63 kgs and until my daughter was around 3 years old that I started to become more aware of how I look.
That's the time I started exercising and watched what I eat and to make the long story short, after the long struggle, I finally got the weight I wanted. So now, for around 2 years, my BMI is in the lowest range of the ideal weight for women my height (5'4")...Unfortunately, even if I am in my ideal weight, i can still see belly fat and I've been struggling to burn it but to no avail. The rest of my body is ok, I guess, but on my belly, I can pinch a good 1.0-1.5 inches of fat around my belly button which is kinda of disgusting. My husband keeps on telling me that I am exercising too much. (But maybe he is just exaggerating it a little bit.

So please anyone out there who have/had the same experience and I beg for any suggestion on how to make this belly fat go away.

To give you an idea on my exercise and diet regimen, I am quiet good at it. I am sure I don't take more than my calorie requirement most of the time. Of course we have these occasions that make us indulge a little bit. But those occasions are maybe approximately 4 times a year.

And with my physical activity, I play tennis almost 6 days a week for approximately 1 hour and after that, I do cardio (jumping jacks, jump rope, mountain climber etc) and do planks (maximum I can do is 4 minutes at a time), do crunches. And for the last week, I went back to strength training which I used to do before I started playing tennis about 5 months ago because of time constraint, I can't do them both. But for one week now, I have to lessen my time in playing tennis to give time for strength training.

Oh my, this is long but that only shows how desperate I am to get rid of this belly fat.

I would really appreciate any suggestion you can give me. And thanks in advance.