East London/Docklands area? Somewhere on the Jubilee Line and DLR.

Canary Wharf/Isle of Dogs or nearby isn't as expensive as you might
think.
Really depends on the sort of property you want to live in and your
budget.

Chelmsford can be got to from Limehouse and Jubilee line to Waterloo is
12 minutes.
With a fast train to woking. You could be there in less than an hour.

And Bracknell's about an hour from Waterloo, which is actually where she'll
be commuting to :-)

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