I hate that I'm about to write this...
I don't think she's saying that a GE is undemocratic -she doesn't care about the population of the UK, just the conservative party.
She's saying that the conservative party has rules and procedures. Those rules and procedures saw Truss elected democratically (amongst the only people that count - tory party members members); and the rules forbid a fresh leadership challenge within the first 12 months. She's saying that undermining a tory leader within the first 13 months is undemocratic, and she's saying that changing the rules because they're currently inconvenient is undemocratic. Again, this is at odds with her previous behaviour - including from a week or two ago; but also again, she only care about democracy within the confines of the conservative party, not the country as a whole.
May she burn in hell for all eternity.