You mean her phone/camera slipping on whatever she's placed it on?
I don't know. It seems completely bizarre that someone would go to these lengths to hide they were on holiday with someone else. It just seems like such an odd and inexplicable thing to do, I don't see why anyone would. Thinking about the lengths she would have to be going to in order to hide it makes me think you're the one with the screw loose here.
It
is bizarre, but Ruby's been caught doing it before many times.
At Exeter she went on quite a few trips that she claimed were "solo" and did everything she could to hide mummy off-screen. Sometime she succeeded, sometime she didn't, sometimes she gave up half-way through and came up with hilariously flimsy excuses why her mummy needed to be there.
There was her "solo" trip to visit archives in Woking, when mummy drove her there and back, seemingly waited outside the building all day for her and they had lunch together. Mummy just happened to have VARRY IMPWORETANT BUSINESS in the area on the exact day of Ruby's appointment. How ludicrously fortuitous!
There was her "solo" holiday to Devon to visit her "friend", where she neglected to mention that the "frand" was her parents' friends' daughter who also attended Exeter, that they were getting the train together and that Ruby's entire family were waiting in Devon. At no point was she "solo". She apparently forgot to tell mummy to keep up the lie, because while Ruby was bragging in Insta stories about her solo trip, her mum was posting family group photos of the same trip with Ruby included.
There was the "solo" camping trip with Blakeney, where it quickly became clear that her parents were parked in eyeshot in their camper van. I seem to recall she did this again, but tried her best to hide that this other camping trip with Blakeney took place in Ruby's back yard.
I'm sure there's others I'm forgetting. She noticed and became incredibly defensive that people were asking why she was spending so much time away from uni with her parents. Rather than either start committing to staying at uni and cutting the umbilical cord, or just own the fact that she doesn't want to not be near mummy, she got on her soap box to lecture everyone about normalising spending 99% of your time with mummy, while lying about being near mummy 99% of the time.
She's a compulsive liar and it doesn't seem to matter how ridiculous or pointless her lies are, she'll still lie endlessly, especially if she thinks there's a chance it might make her seem more impressive or mitigate criticism.
I'm in camp 'Ruby went to Paris alone' but Ruby's cried wolf so many times about solo trips that I totally get people assuming she went with mummy, since doing that and lying about it has always been her default. Her 'back to uni' vlog is packed with so many hilarious lies and embellishments to try to make herself seem smart and her life seem busy-yet-organised (while offering zero details or updates about her degree) that her having lied about going to Paris alone to try to appear independent and adventurous would be the least shocking revelation ever.