When did the person stay awake til 3AM?

Choices:
A. not enough information
B. after she was 9 or 10 years old
C. before her brother was born
D. before she was 9 years old
before she was 9 years old
I think that one of the people who caused me the most misery for the longest was someone that I’ll call “Luna”.
So, most people have probably met that person that acts all suicidal and then uses that against you. For example, you’re talking to someone like that and you’re having some sort of argument and the moment they realize they aren’t winning they send you pictures of their bloodied wrists and say “This is your fault”.
Well, that person was my friend for a long time. Every time I would try to leave her to go to sleep she would threaten to do “something bad” and I knew what she meant, and me, first meeting her when I was around 9 or 10, and I was still extremely naive.
So most of the time, I ended up staying awake til 3 AM on school nights and I would get only a few hours of sleep, and she’d be happy because her life wasn’t worsened at all.
But I think the thing that made me the most miserable, was the fact that it never got better. No matter how much I talked to her, or how sympathetic I tried to be, or how much I tried to convince her to be happier, it never got better. She still acted super depressed, but like it was a joke. All of these things combined to make me completely miserable because it seemed like it was all for nothing.
But I just let it happen, because she was the only person I had and she was really my only “friend” at that point, and all the way up to seventh grade. So for that entire period of time, she certainly wasn’t the only source of misery for me, but she made me feel way worse than I would have if I hadn’t been friends with her.