Petite with belly button hernia. Would a full muscle tightening with floating umbilicus and mini skin tuck work for me? (photo)

Although an exam is needed for the best recommendation, based on your description a standard tummy tuck would be the best option. This would correct your hernia, correct abdominal wall laxity both above and below the belly button, remove excess fat and skin, and correct the "shelf" that concerns you. I've included a video that I hope you find helpful.

First, get the hernia repaired. Then, after you have healed, you can consider a mini-tuck to improve the lower abdomen. I am not a fan of the floating umbilicus because of potential shifts.

In order to achieve a wonderful result it is absolutely necessary to fully evaluate your case. The photo you sent won’t allow to do a thorough evaluation.
Based on what can be seen, you have saggy skin above the belly button, a lot of saggy skin below bb, protruding abdomen plus the hernia which can not be seen.
So you are indeed candidate for a Full tummy tuck, tight muscle repair, hernia repair, using a low incision to remove the c section scar and if your mons pubic is saggy, take advantage and tighten it also.
Be encouraged!!
Dr. Cárdenas