It could be that they know of her business and they've seen plenty man enter/leave their estate.. the same door/location.. and the WG coming out of the property.
I've lived on a council estate and people know about each other's business.
What I will say is, it's weird that they would rob a punter, when they could have just robbed the WG herself after she's done a day's work and has a lot of money on her. So perhaps there is a connection.
I wonder, has anyone been in contact with her since? Her AW account is still up and last login was yesterday.
Almost viable.
Just another story to consider:
As posited above the cunts with the gun eyeball a load of traffic into a flat which they establish/know is being used by a WG.
They decide to roll her and try to get the punters cash too.
Next time the punter leaves they go in and rob her. Take her phone. Set up the next punter(s) for a takedown.
This would explain why OPs comms were all text because no WG to use girly voice to talk him in. Also explains no action on her AW account because she could be in hospital/on the run/captive/whatever.
Just a possibility. I don't give a monkey's about clearing her name. The most important thing has already been established which is OP is unharmed and will hopefully be able to put it behind him soon.

Sure we'd like these fuckers to go down for armed robbery but even if plod taps them for possession that'll be good enough.
Any of you hacker types wanna go all Hollywood on this and nab CCTV stills of these bastards' faces and we track them down (after they get done for whatever crime) then we can go all UKLynching on their asses and go hang the fuckers.
PEACE!