Register all the rest of the extensions and then do as you mentioned.

If they threaten you with keeping her name, threaten back with publicizing their threat.

Hopefully they will see how silly they are being and "let go" since there is very little for them in keeping the domain once she is gone.

If it doesn't work out, they will certainly lose a court battle for ownership of the name:

- it has been tried many times to register someone else's name and the courts will always give it back to the rightful owner, the only exception is if the current owner has a legitimate reason (one of the only valid ones being that it is also their name.)

Don't get too hung up on it. The domain name in this case (the business of her career) is not a determining factor.

It is possible to get any site to rank well in Google when someone searches on her name, and that is much more important than owning her exact name.

my 2 cents, I'd certainly call a domain name lawyer and get a real opinion.