Went through a similar experience like hers many years ago working for a consulting company. In big corporations, it sometimes feels like there are many little smaller companies within. Often they have very distinctive and rigid cultures which could make one feel like you're just a cog in the system, and because they are so big it's difficult to make any significant individual contributions that could generate real impacts. You either fit in or you don't. Besides, the corporate culture is usually being dictated and passed down from higher level management executives who are not really involved in your office day-to-day so it could feel a little foreign at times.

I used to work at a big oil company where its culture was obsessed with safety and they took it very seriously. It's actually a good thing and I get it if you're one of the workers at an oil extraction site because those jobs could be very dangerous. However, we were just the business operation team working in an office located deep inside the city. We still had to follow the same corporate culture and rituals about safety, so without fail every week we had to conduct meeting where team members would discuss various topics related to safety. Since none of us has actually ever worked down at the oil fields, we slowly ran out of topics over time and people started telling random stories like tripping on electrical wires, spilling hot coffee while they were driving, etc... I think it's such a perfect example of how some passed down cultures could feel a bit foreign at times, depending on which unit or team you belong to. Great company though!