I'm saying this as someone who is comfortably middleclass and doesn't interact with the benefits system at all, but I do think that labelling everything a government plot to kill people, as she seems keen to do, just makes her look hysterical and ridiculous.
Are there huge problems with the benefits system, the amounts that people are entitled to, the way it is administered, the way it is easy to fall through the cracks, the way DWP employees hassle people who are clearly incapable of working and the ease with which they apply sanctions or stop benefits? Yes, of course there are. But just because the system is badly designed, underfunded, and poorly administered doesn't mean that the government is planning a modern Aktion T4.
There is no excuse for frightening people who are encountering the benefits system for the first time with "the government want you dead," all it does is devalue the message that the social security system is massively threadbare, significantly underfunded, and failing people. That's the drum she could and should be banging.