Thank you all. Jain - she appeared later in the evening and after being out in the bin I popped her back in her cage and to my horror found her a few minutes later, hanging from the roof again! I thought - she can’t possibly get up there - the entire front is Perspex!
I put my hand under for her to step on and come down, which she did, but proceeded to do this a few more times! I watched how she got up there. Although the entire front is Perspex, there is a tiny gap between where the Perspex ends on one side and where it starts on the door panel. About 1 to 2 mm max! So she was getting a foot or toe into these two tiny gaps and climbing up. Once she got to the top she would lean across and get a foothold in the gap where the door latch is and then reach the roof from there.
From there she would proceed to kind of monkey bar across the cage using her teeth and hanging by her front paws!
This was getting me quite worried. I lifted her down a few times and she was straight back up again! In the end I removed the rainbow bridge at the front, so she could only land on substrate if she dropped - and covered the bendy stick bridge with hemp mat. It’s not a long way to fall as there is so much bedding in there, but it is about 23cm. I was worried she would get injured if she kept doing it.
So I sat there late last night thinking - I’m going to have to get a different cage! Or buy the full Perspex. It would be a better investment to get a new tank style cage (eg the bucatstate with the front opening door) as it’s only £50 more than the cost of the full Perspex. On the other hand it’s still a lot of money!
In the end, late at night I realised it is only the front she can do this - because of the door. She can’t do it at the sides or back because the Perspex at the top is deeper. So I have just bought the front full Perspex panel.
I set up the new nightcam last night to keep an eye on things but unfortunately can’t seem to get it to record all the time! It only recorded when detecting movement - and missed a lot of hamster movement. So I don’t have any video recordings of what she was doing!
Now I think it’s for attention. While she was out of the cage - Raffy was pestering to come out! So after I put her back in she watched me get Raffy out - and he free roams!
Anyway I think her landings are protected until the full front Perspex arrives. That will mean semi dismantling the cage!