If her work is fine (many people, even if they're office based and extroverted and older often have cameras off) where is the issue?
By "team bonding" are there specific people who are pushing for her to turn up in person?
If she's signed the remote working contract, is there some resentment there? Are these people pushing for her to be forcibly "presented" to them?
Would they be making the same demands if she was an older man?
There's definitely a type of unpleasant person who dislikes the new WFH culture.
They're used to physically lording it over younger women, PoC, people who are introverted...Or collecting gossip and having small amounts of social power.
It's not a case of being chatty and iiking and missing people (which is sweet) its just there's very little gossip and control you can do to a few lines on a screen!
As an older Millenial I have demonstrably good social skills and I definitely "did my time" in workplaces.
But I'd often automatically get treated like absolute crap as a petite younger woman..."she's reliable but not respected"...
Same office who would ignore anything I said (or see me as a workhorse), tall bloke walks in (not even a permanent employee) and everyone is competing to be his best mate.
I absolutely respect the younger generation for distancing themselves a bit...Good for them and their hot yoga and matcha lattes!
The "difficult" people at my work are consistently complaining that they don't have access to all the people to patronise and put into a hierarchy the way they used to....