Lucy,
My mom was on ARA-C. the side effects are different depending on the route of administration. The injection tends to have less side effects than the IV infusion. Usual side effects include nausea, fatigue, and drop in all counts. There is usually no hair loss from ARA-C.
Regarding the PICC line. One port is enough to administer meds. However, things may go more slowly if she has to receive several meds since they have to now be given one at a time.
Policies for flushing will vary from hospital to hospital. Also, there are certain types of PICC lines that need to be flushed only with Saline. They should be flushed minimally, after each use and once a shift(12hrs). There are ways to de-clot a PICC line. However, methods include using an anticoagulant and this may not be a choice for your mom if her counts(plts.) are very low.
Good Luck and hang in there,
Lynette