Was checking to see if there were any updates on this case. I'm surprised there really has been nothing. I'm still leaning towards suicide or a staged situation where she didn't intend to die but mistakenly thought an abdomen shot would not be fatal and/or the police would find her in time.
Just wanted to reply to a couple of things.
First, as a somewhat frequent reader of the Daily Mail, I can say that it's been my experience that they very often use the word 'floor' when we would use 'ground'. That's always stood out to me because, as an American, I use 'floor' to refer to surfaces inside a building, but 'ground' for outside surfaces.
I'm not sure if it's a British thing, or what, but, I have read many articles on the DM where indoor and outdoor surfaces alike are all referred to as a 'floor'. So, I wouldn't really read anything into the mention of 'blood on the floor' in the DM. They almost certainly mean blood on the ground, as has been reported from pretty much the beginning.
Secondly, the trunk issue. Some have wondered about how Rita could have closed herself in the trunk, especially with the keys left in the ignition. While I certainly think it's possible that she popped the trunk from the front of the car and left the keys in the ignition then walked around to the back and climbed in/slammed the trunk; keep in mind that, for years, most cars have had pull-down backseats that allow direct access to the trunk. So, it would be very easy to leave the keys in the ignition, lock the doors, crawl into the backseat, pull the seat down, climb into the trunk and pull the seat closed behind you.
So, bearing that in mind, Rita putting herself in the trunk is very doable and possible. JMO.