Apparently it was forensicated, but not until the next day. The presence or otherwise of her fingerprints cannot have been known about by 2pm on the Tuesday. But that was when the press conference took place at which the police announced that SJL had been seen at 37SR. This was not what their star witness had said, and it was before they had checked other evidence that might have undermined this claim - fingerprints inside, the whereabouts of the actual keys, and so on.
The obvious reason to forensicate it would be that if she really went there, then you'd want to know who else did so, too. It would be trivial to obtain her fingerprints. They'd be on her desk phone, or on items in her handbag, or on personal belongings such as her diary and cheque book - they would be obtainable from something.
I recall hearing / reading, but cannot for the life of me recall where, that the house was fingerprinted and no trace of her found. It would be completely perverse, if her prints were found inside along with Cannan's, for the CPS to insist that there was no evident link between them.
It was logical to LE at that stage she had gone there. It was written in her diary and then a man and a woman are seen outside looking at the property so it looks like a showing. They had no reason to suspect otherwise at that stage.
But that tunnel vision becomes a issue as no doubt new tips and leads come in.
MOO