Jen had a hysterectomy to remove the cancer. Typically this is done before chemotherapy is given so that the chemotherapy can mop up anything the surgery doesn't, especially those microscopic cells the surgeons can't get to that can travel to other parts of the body. Is some cases they'll do radiation and/or chemotherapy to shrink a tumor before surgery. However, the uterus is a thick muscle so any tumors that originate in the uterus have a hard time going through the uterine wall. For uterine cancers a hysterectomy is usually all that is necessary to remove cancer from a woman's body. This is why uterine cancer has one of the highest survivor rates of any cancer in women. Depending on grade or staging however chemo therapy or radiation (internal and/or external) may also be completed.
I went through a gyn cancer last year (surgery, chemo and radiation) and they are showing only the tip of the ice berg of what she went through. For example the cameras are there only the day or so before she goes in for treatment. This allows her to go through the worst of the effects of the chemotherapy in private and get back some of her energy and be at her best before the cameras come again. This is my first year watching the show and I'm awed and amazed at what she can do and how well adjusted Zoey is given everything. Total respect for this couple and their commitment to putting family first.