Lizzie is my favourite contestant and I'm so glad she didn't get fired, but in all honesty she probably deserved to be, if only for her weak leadership. She said in the boardroom that Harry M insisted on going to Jermyn Street and Savile Row (I don't know London at all and even I know you wouldn't go there for a bargain!) and that she wanted to go to a market but Harry M wouldn't have it. She was the PM, not Harry M! She shouldn't have allowed him to overrule her when she knew he was wrong. Similarly, if Lizzie didn't want Zara and Hailey to go to Croydon, she should have vetoed it.
Also, while Lizzie seemed very organised to start out with - far more so than Haya - it seemed, as someone said, to fall apart as things progressed. From what Lizzie said in the boardroom, it seems like they'd only organised the first three or four items and were trusting to luck after that. Couldn't they have planned a little further ahead?
Finally, while we don't have a breakdown of the fines, it seemed like the fine for not getting any discount on the shoes was substantial. In the past, contestants have asked for discounts of 1p to avoid this penalty. I think Lizzie should have pushed hard for at least a 1p discount. If she failed to get it, she might have been better failing to get the shoes at all.