You need to have at least 4 points before Semper Invicta otherwise you will lose her path there.
All the places where you can get points for her until that moment:
"Let them go" when you just arrive +1
"Stay hidden" and then "I was stunned by your beauty" in the shower +1
Attack Con at the right time +1
Stay with Dalia when you meet Thanatos +1
Pancakes for Dalia +1
Brownies +1