What does she have at the moment….?
How much better will a £150 camera be? What sort of thing is she after? Is size an issue? Does she want/use a large zoom range….etc.
Might be worh looking for something like a second hand Canon G9 or G10. There’s a few G9’s on ebay that should be on budget. There’s also the Canon S90 to consider but none on ebay at the moment.
Same goes for the Nikon P7000, which is supposed to take good pics, but apparently runs very slowly. Or the P7100 which is supposed to address the speed issue, but will be more expensive.
I fear that a new camera for £150 you might end up with more of the same rather than a large improvement, unless Mrs B’s current camera is quite old.