It took me a bit to catch up (and I am not an octogenarian!).
My tuppence:
I believe it was a setup from the get-go. They prepared it for a while (likely took advice from AlcaTone and Loopy).
They agreed to meet Bianca (or have perhaps met her or at least Elsie has) and have an overnight. Perhaps even suggested it. Yet secretly planning not to spend the night there.
They demanded that Iris must not be anywhere near, and Ioan agreed that Iris will not be there.
Whatever charade they had planned (likely rehearsed), Alice had hired a PI with professional equipment laying in wait near the new Durant Dr flat.
The trap was set. (Firstly, Ioan himself violating the PRO + who knows what; something really bad I believe).
Alice deliberately did not pack the leotard for Elsie's dance class to give Ella a valid excuse to demand they'd drive to Beverly Hills.
The agreement was that Ioan would pick them up from the WH police station and then drive to Elsie's dance class and after that, they'd head to his place.
However, Ioan did not behave the way they expected.
The girls did not expect to have a witness/chaperone and yet there was a psychologist.
That threw a wrench in the works and still, they tried to continue with their scheme.
So, Ella made a big issue of having to go to BH to pick up the leotard, over and over again. Ioan was smart enough not to fall into that trap.
They went to the shopping centre. Ella was antagonising all the way and throwing a tantrum.
Then, when Ioan was away, she called Mommy Dearest to inform her that they are not coming to the ambush and asked for new instructions.
Perhaps faked a panic attack, to get out of the car and away from the psychologist, perhaps really upset as their plan was foiled and she knew she now really had to go and spend the night in the WH flat and spend time with B. Perhaps blaming Elsie for agreeing to get a new leotard and not joining in when Ella threw a tantrum.
I believe that Alice herself called Elsie (poor Elsie seems to be the scapegoat and abused by both Alice and Ella), Elsie went to the bathroom and Alice upset her and made her cry (I suspect it happens often; poor sweet Elsie).
Now Alice called Ella and told her to pick up Elsie and in the bathroom (where Ioan could not follow) they discussed the new plan. She told them to go together to Ioan's place and create havoc (likely giving Ella instructions regarding milk on the bed etc); who knows what else she told them to do.
She had promised Alison Boshoff something big and she had to deliver. She had prepared for hurting Ioan and B for so long, she could not stop now.
As the PI could not go there, Alice told Ella to call her friends and record it all.
As the talk of child abuse had been coming and going for a long time, it may be possible, that Alice ordered her to set up Bianca.
When Ella ran out, Elsie was right behind her. So, there was no door slamming on her. However, she kept screaming
"Don't touch me!" repeatedly and then
"Your girlfriend slammed a door on me!" (which really did not happen as she admits Ioan saying to her) -- these fake screams were all for the benefit of the recording. (As for the bruise, she had it already or it was self-inflicted as it does not match described slamming of the door at her behind her). It was also a rather weak bruise.
This is how I imagine it happened. Alice needed the headlines, she wants to ruin Ioan and get Bianca deported no matter what. She does not care what damage she does to her daughters who are trauma-bound to her.
As for the declaration, it is not the way a 13-year would write. Alice ticked the boxes herself, under the guise of helping, and dictated the whole thing to Ella (like the car park incident letter). As Alice is messy and her brain does not work very well, she made some stupid mistakes.
And then it is as many others have posted -- she just could not wait to gloat, and she started to disseminate the information too early. Also, the article in DM came out too early (the documents were not public yet) as Alice wanted to ruin their red-carpet appearance. Big mistake -- as Andrea pointed out it makes it easier for I & B to prove yet another violation of her DVPRO.
Please, please, please, get the CPS involved, remove the girls from her, and lock her up.
And can someone alert the authorities of NZ of a grown man having private photos of an injured 13-year girl? It is not ok. If the paper trail can be created of Alice allowing this, it is yet another incident showing her as an unfit mother.
However, I'd like to read the statements by the psychologist (and hopefully by Ioan) to get the real story from their point of view. As I said, it is just my imagination of what happened.