I don't think it's a trust issue. I took it more as she feels entirely inbebted to Ai already, seeing how she…
Some ppl are just weak like that and selfless for her it's just was so overwhelming that she wasn't thinking straight so for her she was like I will rather die than betray her like that and add more problems into her life + she knows that mae means the world to her and she's the only think that makes her so happy she doesn't want to do anything that will make her lose her so it's not really surprising bc like she said she would literally die for her