such as abolishing the top 45% tax rate (so the richest would just pay the 40% rate below that). But she didn't want the Office for Budget Responsibility, set up to be an independent assessor of government finances, to assess what this (and her solution for the high energy costs) would do to government finances. So the money markets took a look, and reckoned the government was now a dodgy thing to lend to, and demanded more interest (which then meant personal mortgage rates went up too). That higher interest also nearly caused pension companies to go bust - higher interest meant the existing government bonds they held were worth less. So the Bank of England had to intervene to stop a crash.
Paul Krugman dubbed this the "moron risk premium" - markets demanded a premium to lend to the UK because it has morons in charge.
She binned the plan to abolish the 45% rate, then sacked her political Treasury head with whom she'd cooked it up (ie threw him under the bus). The replacement, Jeremy Hunt, made her reverse most of her other proposed changes. Polling for the Tories has plummeted (one estimate was that, if a general election were held now, they'd only win about 50 out of 650 seats).
This week, Truss apparently had a shouting match with the then Home Secretary, who was in charge of immigration - Truss wanted some more, because there are low-paying jobs that aren't getting filled, and Braverman is ideologically against immigration. Braverman resigned/was fired, depending on how you look at it.
No one thinks anyone trusts Truss to run something, now. The Tories are in a few factions, which they somehow think will be able to choose a new leader who is generally acceptable amongst them. I can't see it, myself.