Boy, this is a tough situation. Pre existing can be pretty tricky. Alot depends on the doctors paperwork. If there is a mention of a possible AN it can cloud the issues. Also if treatment was done during the pre existing clause timeframe of no coverage that's pretty hard to beat.
Consider calling the treating hospital and ask to speak to the patient advocate. Most hospitals have a charitable division that will help to cover medical bills if a person qualifies. Be sure and come prepared with current checking/saving account statements and a list of all bills including what's owed and monthly payment amount. This includes everything from house, utilities, daycare, medical, car, insurances, cell phone, credit card, everything that you owe. The downside to this is any medical bills incurred outside the hospital such as surgeon, and office calls are not covered. The patient advocate may have additional ideas that maybe of help to you.
You might want to consider contacting DSHS for emergency medical coverage. Being it has been a year post treatment I don't know if this is an option. My state will go back 3 months retro. But it's worth a try.
Lastly there is no shame in filing bankrupcy due to medical bills. My attorney friends have told me that the majority of filings are due to unexpected medical bills. Many attornies will offer a free consult to explore this option.
Please let your friend know that she's in our thoughts and prayers.
Raydean