I would like to pitch in since I find the topic interesting. From what I felt and understood so far; as mentioned before she is indeed unafraid of death, she evens longs to find the peace that comes after death, what she seems to suffer from is the process of dying and even living. All of this concludes for me that rather than being unafraid of being reborn (since I bet’s it’s a hassle for her to just reset again and she wouldn’t want that either ) she is just simply hopeless. That’s why the “aloofness” a “boldness”.
When it comes to how powerful she is - ML is for sure stronger than her as he could dethrone the previous head with his own power at young age, whilst she did it with the help of the tear pearls (not sure anymore if they only boost temporarily or permanently ). We have yet to see how powerful she is in comparison to the rest of the heads, what is shown so far, is that unlike other heads, in the “current” life she (physically) awoken later than them, but since she’s been reborn and has memory, knowledge and experience regards her power from her previous lives. We can probably assume she closed the power gap of the other heads with that. Also, she is more powerful than the head of the royal family, since so far they seem to only have non-combat powers, which ranks the lowest in terms of brute power.
Hope this long text helped you a bit xddd

Is the fl more powerful than the other heads or is she just not afraid of death?