Rose of Sharon in our garden
We planted a Rose of Sharon in our garden 2 years ago. Last year it bloomed. This year after a severe winter, the plant has 3 small leaves and nothing else. It gets partial sun and shade mostly.
Yes, that harsh winter may have injured your plant.
Continue care for your plant and I would top dress the soil with some good organic compost.
Wait and see is the best approach.
Here is a link to refresh you on the care requirements.