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Daphne can be just a bit particular when it comes to environment. I would, first, be sure that the soil has plenty of time to dry out down to about 3 or 4 inches or so between watering. Yellowing leaves will be the first sign of overwatering, with a quick downward spiral to the death of the plant.

If you are sure that the soil has plenty of time to dry out between getting a drink, then you can begin to figure out deficiency symptoms.

Feeding with an all purpose, once per year, is often enough to keep them plenty happy.

This article will offer more information on the care of the plant: https://www.gardeningknowhow.com/ornamental/shrubs/winter-daphne/care-for-winter-daphne.htm

Adult scale insects are protected with a waxy covering and are not controlled well with common contact insecticide sprays. Contact sprays can be used during the early/immature stage of the insect pest life cycle, called "crawler" stage, usually in early spring. You can try a systemic insecticide that penetrates the leaf and translocates into the sap that the pests are feeding on. Below are more options:

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

There are MUCH better options for pest control. Neem oil, chrysanthemum oil, or even hot pepper extract work much better. This collection of articles will give you more ways to make your own pest control, along with many other organic gardening tips: https://www.gardeningknowhow.com/special/organic

That is Daphne mezereum!

Here is an article that will help:
https://www.gardeningknowhow.com/ornamental/shrubs/winter-daphne/pruning-winter-daphne.htm

I would not prune or cut branches at this time. Review the care requirements to determine if you need to change anything in your planting or location.

https://www.gardeningknowhow.com/ornamental/shrubs/winter-daphne/pruning-winter-daphne.htm
https://www.gardeningknowhow.com/ornamental/shrubs/winter-daphne/daphne-plant-types.htm
https://www.gardeningknowhow.com/ornamental/shrubs/winter-daphne/daphne-not-blooming.htm

Apparently it is unusual for a daphne to live as long as yours has! Here's a quote from our expert:

"Another potential problem with daphne is that it is known to die suddenly and seemingly without cause. Because of this tendency, you should think of it as a temporary plant. Place the shrub in areas where you can easily remove and replace it as it becomes necessary."

Here's a link for the article: https://www.gardeningknowhow.com/ornamental/shrubs/winter-daphne/daphne-plant-types.htm