i mean, yeah, it was a shallow friendship. they barely knew each other, and their personalities didn’t mesh well. that doesn’t mean that adora didn’t care about her anyway. no one is obligated to click with everyone that they meet.
catra likely does think that the other princesses left entrapta behind, but she’s also blatantly manipulating her and telling her exactly what she wants to hear, specifically to further her own goals. this is…pretty transparent, given her expressions and tone of voice when she talks to entrapta. even when catra inquired about the first ones tech, it was for a specific purpose. catra may genuinely empathize with her on one level, but she’s also using her. entrapta doesn’t realize the full context of the situation, so while she’s doing this of her own free will, i think she would’ve reacted differently if catra had revealed her true intentions outright.