You also don’t know what she’s going through either because the article did not provide any detail at all. For all we know, she could have an easily treated chemical imbalance. I think the point is that a 27 year old without a terminal illness shouldn’t just be able to commit medically assisted suicide.
I don’t know what this person has gone through because it doesn’t say in the article, but 27 is still young. It’s also possible that this is a huge mistake that she would regret with hindsight (well SHE wouldn’t, but all of her loved ones certainly would).
Because with experience comes wisdom. It sounds like she was trying to become eligible under the mental illness section from the one line we are given from the father who said she is in reasonably good physical health.
If it is depression or something, it’s possible with treatment that she could look back on it one day as a dark period, but one she’s glad she made it through. Things that were once so major in life might become minor in the long run.