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You can, but depending on the size of the break, it may be best to remove it! Branches will grow back in its place, over time.

Here are some articles that will help:

https://www.gardeningknowhow.com/garden-how-to/propagation/grafting/reattaching-broken-stems.htm

https://www.gardeningknowhow.com/ornamental/shrubs/holly

This is likely one of several root rots that can plague this plant.

Phytopthora is suspect, but there are several. Identification will require microscopy and staining, which can be done at your closest extension service. Probably, this is will be UT Chattanooga. Here is an article that will help you to find your closes extension service:

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

This article will help you with fungicide use:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

This collection of articles will help you to grow Holly shrubs:

https://www.gardeningknowhow.com/ornamental/shrubs/holly

It could be the luck of the draw with a failing transplant! It happens, sometimes. The best thing that you can do is to cut off any infected growth (not the newer, red growth, but only what is truly brown) and treat it with a fungicide.

Here are some articles that will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/ornamental/shrubs/holly/diseases-of-holly-bushes-pests-and-diseases-damaging-holly-bushes.htm

Those are much better, and detailed photos, which are necessary to help determine what could be the issue.

This is likely caused by the bacteria, Erwinia. The same treatments that I mentioned before will still stand, though bacterial infections like this have no cure. They are very persistent, and will live in the soil.

These infections are usually brought about by pruning with instruments that have not been sterilized prior to use, then transferred to the soil when infected material falls from the plant.

Copper based fungicides are, still, the appropriate method of treatment, while keeping all debris cut off of and away from the plant.

https://www.gardeningknowhow.com/plant-problems/disease/fire-blight-remedies-and-symptoms.htm

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

Curling leaves can be due to insects, disease, or environmental issues. I'm wondering if your plant is getting too much water. The container may be too large and is holding too much moisture. Let it dry out completely before watering again.

https://landscapeplants.oregonstate.edu/plants/olearia-macrodonta

Unfortunately, your photos did not come through. I am unable to see the issue in question.

I could think of, only, a couple of possibilities.

The most likely situation is that it is, indeed, female but has not produced berries up to this point. Looking at the flowers will confirm whether it is male or female.

Less likely, but still a possibility if your shrub is grafted, is that the root (which can be a different cultivar and sex) from the grafted root stock has sent up a shoot.

The shrub forms are not, usually, grafted. This is not very likely, but it isn't to say that this is not what is happening.

This collection of articles will give you all of the information that you could need, pertaining to hollies:

https://www.gardeningknowhow.com/ornamental/shrubs/holly