Is it true they mean to expel her as an undesirable person?

For undesirable person is only to be construed in the administrative sense, in this case.

It was for the protection of the clients themselves, as the fee assured them that undesirable persons would not be present to disturb the meeting.

We may not doubt that society in heaven consists mainly of undesirable persons.

For these three watchers were posted to keep undesirable persons from going upstairs.

Joe Blow is also used, often to suggest a possibly undesirable person.

For the last five years Zeiss has been fighting deportation as an undesirable person.

Or they become associated with some particularly unpleasant or undesirable person.

Are these the criteria used to make someone an undesirable person in Russia?

I am therefore very concerned about the controls on undesirable persons crossing our internal borders.