I'm gonna try and answer this off the top of my head.
After Johnson was booted out there was an interminable contest to decide the leader... the whole country was on pause while 80k Tory members spent ages picking a new leader, and eventually she won. At the point the country was facing numerous issues, one of the worst being these huge energy bills, everyone was crying out for her to do something about that but she at first refused, what she did do was announce a "mini-budget" which did literally nothing to help the poor but which gave uncosted tax relief to the wealthiest - and she gave television interviews saying that she was very happy to make the rich richer, she believed that was the best thing for the country. She then gave in to pressure and capped energy bills but refused to tax energy companies (that would make Britain uncompetitive apparently) which also cost money.
The reaction to the so-called mini-budget, especially the decision to borrow money and give it to the richest, was market panic with the pound falling like mad - and lots of the people getting tax discounts were bemused saying "I don't really need this, why is the country borrowing money to make me richer?". So the Bank of England stepped in saying that they would need to pump £65bn into the markets to arrest the fall of the pound and to prevent disaster, they also said that the inevitable consequence of the budget would be interest rate rises which would cost anyone with a variable rate mortgage more than the government was saving by capping their energy bills. Oh and loads of mortgage companies suddenly made it harder to borrow or simply stopped lending altogether.
So basically a horrendous budget. Then after loads of bad press about all the above, they announced that they would not be doing the tax give away. So at this point we had an all but unelected leader whose first move had been to deliver a terrible budget that crashed the markets, pissed everyone off, needed the bank to step in and spend loads of money.,.. and then a u-turn on the whole thing. And then she went round the country being interviewed by local journalists - thinking they would be low quality parochial bumpkins who would be unable to challenger her like smarter national ones - all of whom rang rings around her and made her look totally stupid.
They then said that they were going to cancel the previous government's decision to raise the top rate of corporation tax (I think that's right, something like that anyhow) - and the response was loads more howls of rage from pretty much everyone. Then she recalled the chancellor from a meeting in the US, they u-turned on this tax break too - and scapegoating the chancellor she fired him.
So you have a leader who was elected only by members of the tory party which is a tiny fraction of a fraction of the country, every economic policy she announced has been deemed so bad it's spooked the markets and she has flip-flopped on two major policies meaning now she's not doing any of the stuff that she said she would do when she was campaigning to be leader; so what mandate does she have to be the leader? Also, firing the chancellor seems to be an admission that his economic policy has been disastrous, but it was very much her policy, she talked it up before-hand and claimed responsibility - so if it was so bad that the architect needed to be fired how can she stay? Every interview she has given has been catastrophic with her unable to explain what she's doing.
The overall impression is of a leader who makes terrible decisions and then walks them back after the damage is done. She is unable to explain what she is doing, she is blaming everyone else for her cock-ups, she just gave a really shit conference and every question was about how she can stay as leader and she couldn't answer. Labour are suddenly ahead by an unprecedented amount in the polls with numbers that mean that the Tories would be all but wiped out as a political force if there was an election now. There are rumours that her MPs already want her to step down - but if they did and had ANOTHER leadership contest that paralysed government for months it would surely be unacceptable.
So right now it feels that Truss is fucked and she's fucked her party and the country - but they can't really get rid of her... plus really who would replace her? And the Tories daren't call an election. So... what is happening?