My Daughter Is A Healthy 18 Year Old College Athlete.

My daughter is a healthy 18 year old college athlete. She noticed swelling in the right bicep area two nights ago. By the next day it doubled. Her trainer sent her to be he ER to rule out DVT/blood clots which they couldn't do until this morning. So last night they gave her an injection of Lovenox, just in case. The ultrasound came back negative but we are unsure where to go from here. Her doctor wants her to see a cardiologist on Monday but we are thinking of taking her home to University of Michigan ER. What would you suggest?