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Hi Sparks. Baking Soda works very well to get rid of moss and does not carry some of the nasty side effects of some of the chemical sprays out there. Sprinkle it around the moss and use your fingers that have been dipped into the baking soda to help spread it around onto the moss. Rain and watering just help wash the baking soda in which is okay. I have heard that spraying the canes of the rosebushes with a product called Green Cure at the "Cure" mixing ratio will get rid of the moss on the canes as well.

I would take a cutting from the rosebush and take it to a local university extension office or seek out a consulting rosarian in your area, they can look at the cutting firsthand to see what might be going on. This could be a bacteria problem that is getting started or it could be normal as some thorns are a dark maroon color and may appear brown. Better to take a cutting in and have it looked at than to try and treat the unknown.

I have left them in the plastic bag with the roots wrapped in wet paper towel before and they have been okay, as long as kept in a cool and dark place. Do not let them sit soaking in water in a bucket for that long though as it is too much water for too long on the root system and can drown them or severely stunt their performance when planted outside. Once the weather cooperates, let them soak in a bucket of water with moo poo tea in it or some Super Thrive in the soaking water overnight. This helps get them going and the super thrive reduces transplant shock problems. I get my Moo Poo tea here: http://www.manuretea.com/shop/ It is so easy to make up and use, the roses and plants will love you for it!

Here is a great resource that discusses cold damage in camellias:
https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellia-cold-damage.htm

For additional tips on saving cold damaged plants, please visit the following link:
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm

It could be a couple things. One is that they need to be planted outside in the garden or rosebed so the roots can spread out. Or at least transplanted into a larger pot as the roots could be getting what is called root bound. You are seeing the early signs so the time to act is now. Also make sure the soils are not staying too wet as this too will cause a loss of leaf sheen and yellowing leading to dropping the foliage.

Many rosebushes are grafted rosebushes. Thus when the top and desired part dies, the hardy root stock portion below ground will take over. This growth is usually very vigorous and depending upon the actual rootstock used, it can take over an area and will usually not bloom much for a couple years then will bloom some. I would suggest trying to find the original desired rosebush. There is a website called Roses of Yesterday and Today that has many older rosebushes and you may be able to find yours there. If you have pictures of her blooms and foliage send them to them and they can help you try to locate your rosebush. Here is a link to an article of mine on grafted rosebushes for you too: https://www.gardeningknowhow.com/ornamental/flowers/roses/own-root-roses-grafted-roses.htm