Sorry its taken so long guys, as you can understand I had to leave work before posting, and there is quite a lot to think about. What I am going to write is anonymised for my own safety, so some things may not make sense. Apologies in advance.
The meeting was to say the least interesting. The PI, post docs, PhDers and RAs all met at 9pm. The PI started out simply by saying Sabrina's work had gone missing and as it was quite a substantial amount, he thought it wise to investigate further. Not strictly true, but I wasnt about to point this out at that time. He said he had been through "Various channels" and had uncovered evidence that there may have been an act of academic sabotage and that there may be some turmoil because of possible disciplinary action.