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Any kinds of specific dark thoughts she had, abilities, and if you want some background so I can make it themed to them and I hope you have a goodnight
That'd be cool! She and her older sister travelled the cosmos for years together to discover new worlds. Her sister was a genius who built their ship and technology, and also gave Katie her powers. In what Katherine perceived to be a total backstab, her sister tried taking her powers away without her knowledge, thinking she would be happier living a normal life. Katherine felt betrayed and left her sister entirely, and landed on a random earthlike planet to live out the rest of her days. Later, her sister tried to reenter her life, and it didn't go well, sending Katherine down a spiral that destroyed the life she had built for herself there, including her to-be marriage with her fiancé. Recently, otherworldly entities have been sporadically drawn to Katherine, leading her to abandon her old life entirely in favor of one as a multidimensional sojourner looking for some kind of purpose.
As for abilities, she can manipulate dimensional boundaries, which requires some lore info that I'll post tomorrow.