Don't get defensive, but have you met this "friend" in person? This is almost always the setup for a scam. It is often African scammers posing as Indonesian women. Even if she is a native Indonesian, I have seen dozens of Indonesians and foreigners scammed by Indonesians too. The set of facts that you outlined are so odd for Indonesia that you should be very skeptical.
Not speaking Bahasa Indonesia is very odd. Everyone I know that was that was raised in Indonesia that was that insulated from the Indonesian language and didn't come from a foreign family was super rich by Indonesian standards or from an extremely poor background in a very remote province. A super rich Indonesian family cutting off a daughter because of her behavior sounds a little off too. I have met a few Indonesians with better proficiency in English than Indonesian, but English was still not their first language. The local language their parents and community speaks is their first language.
My expectation is you will be asked for money to "help" with the cost of the medication or application process.
I have helped students apply for and get student visas to the United States. After admission to a U.S. school with an F visa program, she would be required to show in her account, her parents account, or a third party payer (scholarship provider) enough funds for a full year of tuition and living expenses to be granted the F visa. Even at the cheapest community colleges, that is typically $15,000. If she asks you for a penny, this is a scam and you need to run.
The only way I can see English is her first language is if she went to an English language international school. Most education from Indonesia is not accepted in the U.S., but that is. She should be able to get a stellar score on her TOEFL. It should be easy for her to get admission to a U.S. college, but probably not to where she is thinking. The standards of admission are usually a little more forgiving because international students are usually given no tuition breaks. They are a high source of revenue for U.S. colleges.