If you've been given two different conflicting opinions, you should see a specialist. Whether they will determine that she needs and MRI, I don't know. But do not forget to mention her jaundice and problems eating and breathing.
Go here
http://birthmark.org/node/55 to see if there is a doctor listed close to you.
Go here
http://birthmark.org/experts.php and ask advice of one of our doctors.
Missy