Hi,
Yes, your mother can eat some regular food and use the PEG tube to supplement. If she is throwing up, she really should use the tube for some of her food. She needs to get enough calories and especially enough protein.
Heather had a PICC line, which is similar to a port. She also got a clot which caused her arm to swell. We were told it was not particularly dangerous. The dangerous clots are the ones that are in the lower extremities. They can break up and travel to the lungs, but upper body clots supposedly don't. They did remove the PICC and put one in her other arm, though. I'm not sure what would be done with a port. Heather also took Lovenox daily to prevent any more clots.
Rainbows & hugs,
Rosie