>> From build reliability engineer and mission integration engineer to... program manager?

Looks like:

2017 intern at SpaceX

2019 full time at SpaceX

2021 PM at Apple

Yeah it seems rather quick. OTOH if SpaceX works people as hard as some claim, she might have the equivalent of 5-10 years at some companies ;-)

The best program managers I've worked with have been the ones with highly technical backgrounds.

Buddy of mine went from EE Major, test engineer, to PM