It wasn't. There's an official statement from the hospital confirming they had no beds left. Of course, the media chose to report it, but they aren't lying.
The right-wing media lied about it though, and it's a very relevant example of online disinformation:
"Despite the claim that the photo was staged having been acknowledged as false, it [the claim] has continued to spread on both Facebook and Twitter [...] Telegraph columnist Allison Pearson retweeted screenshots of the Facebook page to her followers twice, telling them “I presume this is genuine”, and adding later that the photo was “100% faked”. Her posts have received thousands of retweets between them."
https://www.theguardian.com/media/2019/dec/10/woman-says-acc...
(This is already downvoted, along with every non-pro-Tory comment in this discussion. Probably it will recover, HN usually does, but it would be better if people who disagree counter the arguments, rather than just downvoting what they're uncomfortable with.)