Neurodivergent or not, work ethic is a skill that you grow and train over time. Whether you start your first FT job at 16, 18, after uni, or later, those first few months are a massive adaptation. Grace has never been in a position where her schedule wasn't completely her own. I think she's missed out on developing that skill by starting at the top, and she would struggle to adapt to any kind of m-f 9-5 situation if she had to. Whether that counts as laziness idk, most people wouldn't live that lifestyle if we could avoid it.
Also I think she just likes complaining. She always has something to prove about how hard she works, and the complaining is part of that.