WHY IS ANNA-HENRIETTA THE ONLY NPC THAT RUNS AS FAST AS ME

The whole game, every npc runs just fast enough you fall behind walking but slow enough that they'll fall behind if I run. Ok, guess you couldn't get it right. BUT THEN IN THE DLC ANNA-HENRIETTA FUCKING SPRINTS AND I'M SITTING HERE LIKE, IF YOU COULD DO IT SO EASILY WHY DIDN'T YOU???!!!? AAAAAQH