It's probably mosaic, but don't be too worried. It might hamper vigor a slight bit, but in itself isn't fatal in the short term, just ugly. When warmer temps arrive, most likely all visible signs will disappear. It's possible the freeze just stressed the plant enough for the symptoms to appear. The plant has probably (almost assuredly) been infected since you bought it.

Long term, the effect of mosaic, which isn't actually just one disease, can cause a (very) slow degradation in the plant. But most of the time, the rose will do just fine. However, you're on the border of truly cold winters, which is where you start to see the lessened vigor have a real effect. Just watch her, and if she starts to grow backward you may have to replace her. I'm betting she'll be OK if you just give her the TLC you would give any rose.

John

Thanks John!

I edited my comment while you were reading, evidently, lol. I just added a little more info.

I have had several roses infected with RMV over the years, and their vigor has never been affected. One is at least 12 years old, and another is 17 years old. Diane

That’s very nice to know Diane! I

John: I noticed some leaves on the lower part of the plant were dark green! I will cut some of the infected leaves and hope for the best!

Without a scientific test, you will not know which virus or viruses your plant has. Also you do not know how viral (strength) your virus(s) is (are). Also you do not know how resistant your rose is to the virus(s). Since many (most) rose viruses are more virulent in cooler climates, In your zone there is the possibility of spread.

Thanks Henry!