Which bit do you think contravenes NHS/NMC rules?
If it's being pro-trans, I hate to break it to you but there are no parts of the NHS that have fallen harder for Stonewall than the regulators. There is zero chance that the NMC, or NHS England/Scotland/Wales are going to take action against her for expressing a pro-trans view.
If it's being anti-Tory, then her comment (via the meme) is very mild. She isn't saying that she wouldn't give a Tory good care or that they don't deserve NHS care. I see more contentious stuff than this meme from HCPs on social media literally every day. If the NMC went after nurses for this level of political comment, we wouldn't have any left.