Though she was my first R3 & I don't regret doing it, but that was bcoz I only had a cosmic T5CC & didn't have any better option to become Thronebreaker
She is good enough to be at R3, but I would prefer at least 8-10 other cosmics before going with her
Just depends on what you like and what you need. I'll be taking her to up soon myself just for Incursions and some basic questing, but that's mainly because I used her constantly as a maxed 5* and I really enjoy her. There are much better Cosmics worthy of the resources, and I definitely wouldn't be doing it if I couldn't afford it.
The awakening gives her the indestructible - if that's going to be of particular use to you, and doing so will be on particular benefit to you, then go for it.
Comments
Though she was my first R3 & I don't regret doing it, but that was bcoz I only had a cosmic T5CC & didn't have any better option to become Thronebreaker
She is good enough to be at R3, but I would prefer at least 8-10 other cosmics before going with her