I don't think there's anything unhealthy about it and she has no real issues in her life that would necessitate a change.
As someone that tends to do that, it can be unhealthy. If you don't keep it in check, sometimes you end up lagging behind as you try to analyse every little thing instead of living in the present.
Maybe we just use the word "unhealthy" differently.
The dose makes the poison.
It's like disassociation, doing it occasionally is normal, but doing it all the time is unhealthy.