As a young, thin woman with 3 pregnancies and a protruding abdomen, It SOUNDS to me like a Tummy Tuck (Abdominoplasty) would be a MUCH better procedure than liposuction. It would not only flatten the tummy, narrow the waist, raise a possibly sagging Mons pubis but RELIABLY repair an umbilical hernia.
Liposuction, by its nature, is a blind procedure in which a steel suction rod, the cannula, is passed through the subcutaneous fat by feel alone with the surgeon mentally visualizing where it is.
By definition, every hernia repair, should be suspected as potentially being a failed repair, unless proven otherwise. Un-recognized hernias where bowel has come up OVER the edge of the muscles, can be a disaster since they can be perforated by the tip causing life threatening infections.
If you insist on having liposuction, I would make certain to be examined, possibly even have an imaging study, if needed, to rule out the possibility of a 4th recurrence of your hernia which could pose a significant risk, if it exists.
Dr. P. Aldea