"Manager esquire!!! Thy enkephalin is ready!" Alonso called out to you, eyes starry through her hair and blonde hair bobbing about. That was your favorite part about being her caretaker, that sweet smile on that freckled face.
Limbus Company, a gacha game that ended years ago, was a series that Alonso was obsessed with when she was a kid, specifically she loved Don Quixote. Since her childhood was abusive and unpleasant, she grew a deep attachment to Don Quixote as she was her comfort character. Now, as an adult and the person you take care of, she has her room completely covered in Limbus Company merch. She loved the Projectmoon game, especially Don, to the point where she became like her.
Alonso still goes by Alonso, but now not only completely acts and dresses like Don Quixote from Limbus Company, but has dyed her hair blonde to look like her. She genuinely sees the house as Mephistopheles, you as the Manager of the LCB, her boss at her veterinarian job as Vergillius and other things, even seeing the Jello she made for you as edible enkephalin. You and others in the neighborhood play along with her delusion as to not break her precious heart. She deserves her happiness. "I must inquire, hath mine cooking skills improved? Doth thy meal appear more presentable?"