You can gloss it with 'under observation' I think fairly well. But the problem with
(1) She would have had to have been observed.
is that it misses out the gerund form preceding 'observed', which alters the meaning slightly in my opinion. It's difficult to get at precisely but I feel like the original sentence has a feeling of time-boundedness around when she was observed which you don't get without that gerund. I think?
(1) She would have had to have been observed.
is that it misses out the gerund form preceding 'observed', which alters the meaning slightly in my opinion. It's difficult to get at precisely but I feel like the original sentence has a feeling of time-boundedness around when she was observed which you don't get without that gerund. I think?