Good question, and I think it depends, like everything in life.
My kid actually tried going off Lithium. She was staying with me for a few months and got her sleep cycle and daily rhythms pretty stable so it was a good time to try, but it didn’t work at all. She went right back on. But over the years the dose is much lower than at first.
Doctors have told us that for depression, bipolar, seizures, any brain disorder, there is a “kindling” process that means each episode is worse than the last. Medications and therapy can stop that process and medications if taken long enough can heal the brain. We were told.
But that doesn’t mean that a brain-based disorder that might be life long will entirely go away.
It sounds like your daughter has a lot of tools now and could try. At a good time, when stress is low/
One of my friends went off her antidepressant and got depressed again. She went back on but at a small dose, like 1/4 of what she had been on, and is happy with that. I know someone else who went off and was fine for 3 years but is considering going on again.
There are many sites online on how to get off antidepressants. Doctors often say “cut it in half for a week then go off.” Many people I know took months to get off. Some used liquid meds to be able to taper even when dose had gotten small. And using a med with a longer half life while getting off a med with a short half life can also help.
I could really empathize with your daughter’s story. She sounds brave. And is lucky to have you!