Muscle repair failure after 3 months - revision with mesh advised, is this a good solution?

I had TT w/MR on 9/12/18 for a large diastasic recti repair. I am 5'2 and 125lbs, so obviously not overweight. The surgery went well and I am now 12 weeks post op. My stomach is flat, but when I get up from a "laying down" position my stomach is making a cone shape again and I can feel a gap and separation that was once tightly closed after surgery. My PS advised a revision with mesh reinforcement. He thinks my fascia might be too fragile and the sutures are tearing through. Advice?