Help Reese with Unexpected Medical Bills

My bestest friend in the whole wide world, Reese, was recently hospitalized unexpectedly; after coming down with a cold, she started to experience a racing heart rate every time she stood up. When she went to be seen at Urgent Care, they told her she was having left-sided weakness and needed to be seen in the ER. Reese was hospitalized because of these symptoms; she had three MRIs, a CT, several EKGs, and lots of blood tests while hospitalized, and the bill is over $40,000. The doctors still don't know what's wrong with her or why this happened, meaning she will need follow-up appointments and more testing. She is still having trouble walking as well as troubles with her heart, so her ability to work is also limited. Any help is greatly appreciated, and PLEASE SHARE! Reese is the kindest and most genuine person I have ever met and she deserves the world!