Rose Plant Wilting?

I grow a lot of rose plants here and start them by cutting most of the time. When I transplant one of the plants into a larger pot it can go into shock as your plant has done here. Overwatering the plant is not good. I would suggest that you do this right now. Remove the plant from your new pot and mix some dryer soil in with the wet soil and plant the rose bush back in the pot. Do not sit this out in direct sunlight for a few days. Every 3 days add just a bit of water to the pot to keep the soil moist but not too wet. The leaves will soon be fine and the plant will come out of shock.

A lot of plants are sensitive when transplanted to larger pots and they do go into shock when this one happens. Most of the time it will take a few days for the plant to adjust and be fine. Right now I am not sure what season you are in but if you are in fall and just before winter I would not leave the plant outside for the winter. You can place the plant on a covered patio or even in your home until it gets a good start. Just make sure you give the plant plenty of light and sit it near a window.

You made a big change in this plant's life as you brought it home from probably a controlled environment and did not give it a chance to acclimate itself to your environment before removing it from it's home to a larger pot and different type of soil.

Transplanting is a major change for a plant and almost always the plant will go into temporary shock and may wilt and loose it's leaves. Sometimes the plant does not recover or it could take several days/weeks for it return to its formal health.

Be sure you do not place this plant in direct sunshine for at least 2-3 weeks and then only gradually until it looks healthy enough to stand full sunshine. Roses require 5-8 hours of sunshine a day but not when they are freshly transplanted.
The soil should be similar to the type that it had originally and the pot should have excellent drainage (hopefully the new pop was not a lot larger than the original pot).
Let the soil dry almost completely before adding water and then give it a good soaking in another pan/pot as you should not get water on the leaves or you'll wind up with 'black spot' on your plant. Do not fertilize until you're ready to place it in the sunshine and then only small amounts.

This poor plant is much to wet. It needs proper drainage and full sun. It seems that the soil is overly wet. Check the bottom to make sure that the water has enough room to flow out of the pot and not sitting.

-www.hunker.com/.../how-to-take-care-of-a- mini-rose-plant