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she was upset when Lindsay Hoyle told her to keep her answers short
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she had an argument with Keir Starmer (possibly about her keeping her job, or about how to handle the inevitable questions about the new £5.5bn per annum black hole) just before PMQs
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Keir Starmer refused to say she would keep her job in front of the whole country. If he genuinely wanted her to stay, he would just say 'of course she's going to still be Chancellor' and that would be that.
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she is under immense pressure because she knows she will have soon to breach her fiscal rules, she knows she is responsible for many of the decisions that will lead to that, and she knows the how serious the consequences of her failure will be. We have seen recently (even just today) how vicious the bond market can be.
In short, I believe she was crying because of professional pressures (understandable ones, though largely of her own making, and about which I have little sympathy) and not nebulous 'personal' reasons.
If her parent or partner or child or grandparent or pet is ill the natural thing is to just say 'sorry, a close relative is in hospital and my emotions got the better of me'. Everybody would understand. You don't need huge reams of evidence but you need to give the bare bones of an explanation. She is trying to style it out but we can all see through it.
I will apologise if I'm wrong but long experience shows that 'personal reasons' almost always means 'I'm skiving or jobhunting' when a colleague in the workplace uses it to excuse their time off.
I believe it means even less when uttered by a politican.