POLICE say they have "indications as to why" Gaynor Lord "behaved the way in which she did".
However they say there is nothing to suggest she suffered with mental health issues - but that they are treating her as "vulnerable".
And officers have gained access to her mobile phone and are tonight searching it for clues.
They also do not believe Gaynor had met anyone at Norwich Cathedral, and they do not know if she is religious.
Chief Superintendent Dave Buckley said: "There is nothing to suggest from that period of time that she's in the cathedral, that she's had any contact with a third person."
He continued: "Anybody who's missing in these circumstances is vulnerable.
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"In this particular case, we've got a lady whose disappearance is out of character, it's now been quite a considerable amount of time since she was seen alive. That makes her vulnerable."
Asked if there was anything happening in her personal life which would explain her going missing, Ch Supt Buckley said: "Not at the moment, no."
He added: "There's nothing that we've been able to establish that really gives us a clear position on her state of mind that I would feel any degree of confidence in saying what we think it is at the moment.
"I think we continue to talk to friends, family, anybody who can help us that we know she's had contact with."
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He said Gaynor, as far as he knows, has not gone missing before.
It comes as...
- Witness says she saw woman "removing coat and perfoming yoga pose"
- Cops release CCTV of missing mum running along streets of Norwich
- Specialist underwater divers join the desperate hunt
- CCTV shows mum holding white item
- Gaynor 'met someone at cathedral' before she vanished
- Gaynor’s husband has been left “in bits” by her mysterious disappearance
- Detectives have linked up with Nicola Bulley cops
- Gaynor pocket dialled a pal after she was last seen on CCTV
"We've got some indications as to why she behaved the way in which she did, but what we're doing is we're just working backwards now to actually truly understand what may have taken place.
"I think, just cautious of everything we know at the moment because clearly we've ended up in the situation that we have, which is not usual, is it.
"I don't think any of the conversations that we've had are completely informing us to why her state of mind has ended up to being what it was."
The force has around 60 cops working on the case and has received 30 reports from members of the public.
Yesterday cops shared the last CCTV image of the mum on St Augustine's Street at 4.01pm - meaning the second call was after final sighting.
They published an image of Gaynor smiling ear-to-ear as she left her workplace - Bullards Gin, at Jarrold’s department store.
Then, in a CCTV clip, the mum can be seen running along the pavement with her coat in hand.
She seems to be in a hurry, rushing to cross the road.
The mum seems to spend 30 minutes at the cathedral before she is spotted on CCTV again.
She then makes her way along the street, putting her coat on as she walks.
She is last snapped on CCTV at 4.01pm.
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It is now thought the mum may have met someone at the cathedral before she vanished.
Police are also said to be "linking in" with the force who worked on the disappearance of Nicola Bulley.