I’m no help – we’re off to look at an Alpine 160 for my wife this morning, but I i may have the odd comment.
How tall is she? Over 5’6″ and she will probably find a “men’s” bike with a ladies saddle and a stem swap pretty reasonable. If you’re anywhere near Sheffield pop into OnOne’s showroom – they have some deals at the moment.
26″ wheels make sense for shorter people, 29 for larger – but that’s a generalisation. Specific bikes and people differ.
What’s she really using it for? Cycle paths and bridleways differ considerably – some are MTB territory, some you could do on a road bike. For the cycle path up the river in York I use a £50 1993 Kona – light, quick, responsive.
Apart from that last year’s model is always a good start around this price point.
Hope that was some help.
Edit: those Beinn 29s look nice