These types of tweets are so meaningless. It's impossible to know if care was adequate or not, because no one but her and her GP know the backstory, her medical history, what other medication she might be on, what allergies she might have, what may have worked before, etc. I find it's never helpful to discuss particular health issues and medication with anyone but health professionals. Lots of people have well-meaning advice, but often you don't even know yourself WHY you may have been given tablets X over Y or at what dose. So they may/may not have worked for you, but that doesn't mean it wouldn't work for someone else.
She's of course insinuating suicide/self harm here. In my personal experience, if you'd state that, you wouldn't get sent away, but I appreciate that this may not be true everywhere. It's a very tricky issue, because this is of course very serious, which is why it's also used as a weapon by narcs.