From the Roswell Park Cancer institute:
"A Mediport is a device that is implanted under your skin so that medications may be delivered directly into your blood system. The Mediport® is designed for safe, long-term use in your body. It can stay in place permanently if necessary. When not in use, the only care a port requires is flushing once a month with a solution of heparin and saline to prevent blood clots from forming inside the line and causing a blockage.
You may also hear the terms Port-A-Cath®, Infuse-A-Port®, or other similar terms, these are other products that serve similar functions.
The port can be used to deliver medication (arterial port) or draw a blood sample (venous port) by inserting a special needle into the port. The needle connects to the catheter inside the port; the other end of the catheter is located inside a fairly large blood vessel."
I've had many patients with mediports. Some with IV fluids running and some without, so she could have had it before this particular admission. If she was on long term antibiotic therapy that's probably why she had it. I hope that helps.