I got a Silent Hill vibe at the start, guess there was a reason for that after all.
The suicide wasn't intentional. She fell asleep in the tub. She may still be drowsy from the sleeping pills effect and/or emotional exhaustion even though she just woke up. Her girlfriend did make that promise to her about going to the ocean somewhere shortly before she fell asleep. Unless that was all in her head, but her reactions after waking up says otherwise. So she didn't intend to die at all. Just chalk it up to an unfortunate accident if anything.
There are some bits of the flashbacks where it feels more nightmarish than actual events, unsure if that was the intended effect. It sucks that she's basically stuck in this loop forever. What the fuck is this, Silent Hill?