>>1812679
She was /ourgirl/ at launch, but nowadays A-Ranks other than Ver and Heimdall aren't really recommended investments.
If you pour copious amounts of resources into them and carry them with meta supports like >>1808186 you can still clear some endgame stuff, but you'd be better off using those resources to raise several s-ranks and clear more content.
You can still use her on story quests and similar since they are tuned around old content.