Yes, it is really common for the navel to be used as an incision site for a laparoscopic procedure. Laps are a minimally invasive kind of surgery in which several tiny incisions, sometimes referred to as "keyholes" because of their size, are made to allow the insertion of long metal tubes called trochars. The trochars allow the passage of specialized surgical tools and a flexible lighted camera called a laparoscope to access the abdominal or pelvic cavity, which is inflated with carbon dioxide to make it easier to move the tools around inside.
It's interesting that she admits to having had a lap. Most of the time, surgeons only use them for relatively simple, routine procedures. For anything really complex like removing a giant tumor, they still need to open you up.