Oooo x4 haven't heard of that - looks good.
I actually like the look of the x6 compared to the x5, both being city SUVs. Think the x5 may have more functional cargo space.
However, having sat in an X6, they are quite long and big. Will your mum be comfortable driving around in such a large car? parking etc. The X5 may be a tad better. It also has better visibility. Also have you thought about her being able to get in and out easily daily without risking falling over and breaking something?
The Evoque as bmroxm5 suggested is definitely a good suggestion. Thats one hot looking SUV. They did trade off looks for visibility big time though. The blind spot is huge and the rear window is narrow - but people can just get out of her way when she's rolling
