Can Health Premium Be Increased if a Claim is Made?

Hello,
My friend has this condition and is insured through BCBS, although they do not know about it as she is going untreated.

She is in constant pain but refuses to get treatment because she says her insurance will double if they find out, and they are already paying upwards of $1500/month for the three in their family and have a single income. I thought Obamacare specifically protected against cases like this.

What resources does she have if they do try to double her premium? She is too scared to research/ask questions for fear they will find out. I am pretty ignorant of the new laws but felt certain her case was one of the main purposes of the law. I saw this under FAQs…

Does the law make it easier for adults who have medical problems to get health coverage?

Starting in 2014, the law prohibits insurers from denying coverage to anyone with pre-existing health conditions, or charging them higher rates because of their health status. That means you will be able to buy health insurance even if you have a pre-existing medical condition.

Please, any information I can give her will help!