Will she be treated in an outpatient setting? How are her veins? How often will she need labs drawn?
TAC generally is given only every 21 days. Some doctors want labs drawn more often, but unless there is an additional problem that needs to be monitored, she should only need chemo related labs drawn before each treatment.
Where I work, we have the patients with ports come in a few hours before their chemo. We access the port, draw the labs, and leave the port heplocked until they return for their chemo appt later in the day so they only have to get stuck once.
Most of our patients receiving chemo do not have central lines/ports. If they have decent veins and are getting intermittent doses(vs continuous infusion over a period of days), we will use peripheral sites. The only exception is Vinorelbine. I've seen about the same number of problems with ports (infections, positions shifting, catheters floating up into the jugular!) as problems from using a peripheral vein. We have a well staffed clinic, though, (well, most of the time), and can monitor the patients closely. I have worked in other places where staffing was poor, infusion pumps were unavailable, and the chance for an IV site going bad would be much higher.
I would be more concerned if the frequency of treatments were weekly. Chemo is hard on the veins, but it is not likely that her veins will be 'ruined' from the regimen she will be receiving.
If she will be treated inpatient, I would definitely go for the port since she will less closely observed during her treatment. If she has good veins, is getting her treatment in a well staffed and well equipped outpatient facility, and does not need labs drawn more frequently than her treatments, I would have no recommendation either way. It would just be a matter of weighing the pros and cons of her preferences.