Any help would be much appreciated.

The time of year when there will be alot of frogs is spring at breeding time, when frogs will come from all directions. This may be the time when she chooses not to go in the garden. After mating time, most frogs will disperse and leave your garden, although a few males may stick around all year. They will tend to sit in the pond just peeping out.

Suggestions:
1.Encourage a neighbour to build a frog friendly pond that the frogs might prefer.
2.Put fish in your pond which will eat some of the tadpoles, meaning you don't get so many new frogs each year.
3.Please don't scoop up all the frogs you find and take them to a wild pond, because this could spread disease to the wild pond if they have any infections like the chitrid virus or red leg disease.
4.I don't know where in your garden your pond is but is it possible to zone the pond off from the rest of the garden. Either by building a low wall or fence around it, or a generous buffer of planting round it. That way the frogs will be out of sight and out of mind.
5.I don't think there is a way to solve the problem of the mating week or fortnight. I think she may just have to bite the bullet and just go in the front garden then.
6.In spring, fish out a few tadpoles for her to look at at close quarters in a glass or a tank. Then progress to baby frogs when they emerge. Remember to have wet hands and put them in a glass with some damp moss for her to have a look at them.
7.If she has a camera, set it on macro and ask her to take a photo. She may then concentrate on the photo and not the frogs or tadpoles.