How well-known are soap actors, really? I'd never heard of her - confused her name in the first instance with Katherine Jenkins - they tend only to come to public notice when they behave atrociously. One that springs to mind is the woman some time ago who netted a serious on-stage role and promptly alienated the wonderful Jonathan Pryce (of all people). In his long career I've never heard him say such a thing about anyone else, but he was on record at the time saying he never intended to work with her again.
The baker's response is robust and undeniably strays away from professionalism. Sarcasm isn't a good look for a business. But there's also the possibility she was sick and tired of these requests, and wanted to put the message out there that any similar approaches would be strenuously declined. I can see the reasoning.
As for screenshotting the email communication, this might not have been necessary had the actress and her representatives not lied repeatedly: once saying the email had been misconstrued (it clearly hadn't), once claiming the baker was hungry for publicity (they approached her, not vice versa), and then trying to tarnish the reputation of a small business in the middle of a cost of living crisis. On all counts, this is simply appalling behaviour.
As far as the jobbing actress is concerned, she's now seeing a nice manifestation of that old adage 'play crap games, win crap prizes'. It's quite satisfying that a person who made a concerted effort to harm someone else saw the grenade they personally lobbed blow up right in her own face. Serve her bloody right, IMO. Maybe there's an outside chance it will teach her to treat others better in future.