Can't lose weight!!!

Gemma

So short story here, I had baby 2 1/2 years ago and CANNOT lose the 20 pounds I gained. I workout, eat right 90% of the time, and have an active lifestyle. I'm even trying golo, which is supposed to aid in weightless and NOTHING is working. Not a single pound or inch. I'm strong, my muscles are good. So it's not muscle weighing more than fat in this case. Has anyone experienced this and had something that worked to lose the weight? For reference I'm 34 years old. I weight 148, normally 132. And I'm 5 foot 3 inches. This last baby was my 3rd child.