1.) Thimble learned alchemy mostly from her mother, who was desperate to have one of her children take an interest in intellectual pursuits like she did. Thankfully, Thimble was fascinated by science since a young age and desired to see what exactly it was capable of. For her, alchemy is an important method of problem solving that not many other people can do. It gives her a way to survive on her own without relying on mundane jobs. Alchemy, like life itself, is unpredictable and that keeps things exciting.
2.) Thimble loves art, but she believes science holds more value in society because of its practical uses. Science has led to a better understanding of the natural world, it's created much-needed medicines, and shapes the world in tangible ways. Art can be influential, certainly, but science is useful.
3.) Thimble loves her creativity and her ability to apply it to most aspects of her life. Her alchemy is not just an outlet for her scientific endeavors, but her artistic ones as well. When she's not tinkering, she's tailoring or working on some kind of craft. She hates her inability to comprehend emotions. It's difficult to bond with others because they don't understand how her mind operates. It doesn't help that she doesn't know how to express herself appropriately, so people often think she's rude, blunt, or doesn't care about others.