Thank you everyone for your kind thoughts and hugs, I really needed it. She is doing much better and her temperature is slowly going back to normal.
Yes the nurse also told me the catheter does not hurt, it's just uncomfortable. But judging by Trinity's cringing and flexing her body, it looked like it hurt her! I couldn't imagine how it couldn't hurt at least a little bit.
Trinity sends everyone a big smile and thanks to everyone for their concern!