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Unfortunately, your photos did not come through! There are a couple of possibilities of what could have went wrong.

Sometimes, some specimens are not as hardy to disease as others, such as Verticillium Wilt Disease. It can destroy one or two, but not all of your shrubs.

Another thing to consider is pests in the area. Moles, voles, and other burrowing creatures can destroy roots or cause infections while doing so.

I could recommend taking samples and photos up to your local extension service. They may be able to help:

https://www.gardeningknowhow.com/extension-search

This collection of articles will offer more information on the subject of the shrub:

https://www.gardeningknowhow.com/ornamental/shrubs/mock-orange

Are the ants huge or is that scale on the stems? Ants usually appear on plants that have insects such as scale or aphids, both of which exude honeydew, which ants love. To get rid of the ants, you need to get rid of the insects. Honeydew can also cause sooty mold. Here is more:

https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-aphids-and-ants.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm

https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm

This is, likely, grafted to a different rootstock variety. Usually, growth from the root will indicate stress from the top of the plant. If left alone, these shoots will take over, killing the top graft, which is the preferred specimen.

I would remove all instances of growth like this, and go ahead and get it into a more comfortable container.

https://www.gardeningknowhow.com/ornamental/shrubs/mock-orange

The appropriate time for pruning mock orange (Murraya paniculata) would typically be during the late winter or early spring. This is when the plant is generally less active in terms of growth, and pruning during this period helps stimulate new growth and maintain the plant's shape. However, it's essential to monitor the specific weather conditions in your area, as they can vary, and adjust the timing accordingly. Always aim to prune when the plant is not in active growth, and avoid extreme weather conditions.

Here are some articles that will help:

https://www.gardeningknowhow.com/ornamental/shrubs/mock-orange