Her friends might become initially fearful. For example, Pinkie Pie might not be as bubbly around her, and Fluttershy could be too scared to approach her. They may start to distance themselves until they understand Twilight's reasons for using the dark magic.
At first, her friends would likely be in denial. They've known Twilight as a kind and good - hearted pony, so they might think there's some external factor causing her strange behavior. For example, Pinkie Pie might try to cheer her up with parties, thinking that would snap her out of it.
Her relationship with her friends would likely become strained. They would be shocked and scared of her new demon form. For instance, Fluttershy might be too afraid to approach her. Pinkie Pie's usual bubbly nature might be dampened as she tries to figure out how to deal with this new Twilight.
Her curiosity might become even more intense. As a dragon, she has new abilities and a new form to explore, so she'll be eager to figure out all the ins and outs. For example, she'll be curious about how her dragon body works mechanically and magically.
The more understanding friends would try to find a way to help her. But there would be a lot of tension. For example, if she had a romantic relationship before, her partner might be torn between loving the person inside and being repulsed by the demon form. Communication would become difficult as she might not be able to control her new demonic impulses and might lash out at them.
It could be a pony who is extremely extroverted if Twilight is introverted. Someone who loves chaos and spontaneity instead of Twilight's love for order and planning.
With her friends, some might distance themselves, especially if they don't want to be associated with the 'drama' of a teenage pregnancy. But true friends could become closer, offering practical help like babysitting or emotional support.
When Bella has a power like super strength in fanfiction, it can change how others view her. Her friends might be in awe of her new ability, but it could also make some of them feel inferior or intimidated. Her relationship with Edward might also change as he has to adjust to not always being the one to protect her. He might feel a bit of jealousy or pride in her newfound strength.
It might make her seem more resourceful. Instead of relying solely on magic, she's now using a muggle weapon. This shows that she's open to different ways of solving problems.
In her story, Twilight Sparkle's growth as an adult is also about self - discovery. She discovers more about her own powers, her place in the world, and her long - term goals. For example, she might realize that she has a greater role to play in protecting her kingdom or spreading knowledge of magic, which drives her to further develop herself both magically and personally.
It could strengthen some relationships. For instance, if there's a character who really understands her decision to cut her hair, it might bring them closer. They could share a deeper bond over her new look and what it represents for her.