hi purpleshelley,
Along with crate training moving your dogs evening meal to a slightly earlier time and restricting access to water just prior to your last toilet trip should help. Once you have got her used to using the garden to toilet you may also be able to toilet her later at night and earlier in the morning therefore reducing the time she needs to hold on. Every time you take her out of the house for the toilet walk try her in your garden first, if she toilets praise her warmly and treat her and make a big fuss. If instead she waits and goes while on a walk don't make any fuss at all.
All the best,
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