Roses and succulents are not compatible in a pot together. Roses need more water and a different soil. Your problem could be soil. The pot looks like one that has a drain hole, does it?

Just guessing here--Probably your best bet is to remove it from the pot, dump all the top dressing and soil, repot in commercial cactus and succulent mix combined 50/50 with perlite or pumice from your nursery. Don't water for several days. Keep in shade until it recovers. Personally, I don't like top dressing like that because it makes the soil retain water longer. Succulents keep water in their stems and leaves, so they don't like "wet feet."

Hi, thanks for suggesting advice. The plant has always been as you see- in its own pot. The rose plant is in a separate pot next to this one.

I bought this from the Brooklyn Botanic Garden as is- I must imagine they put it in the proper soil?

I agree Katherine. It is like they use the cheapest soil they have lying around.

it's true, in a greenhouse with perfect light and water and regular ferts you can get away with cheap potting soil but in typical indoor conditions we need to hedge our bets against overwatering with a fast draining soil

As someone who visits the Brooklyn Botanic Garden (BBG for short) several times a year I can tell you the BBG isn't selling their own plants. They're provided by outside vendors. I was horrified to see them selling succulents in glass terrariums (which are doomed to fail). Either the BBG's garden shops doesn't know or care, which I found disappointing.

So reasonable tho' it seems, even folks who should know better how to pot stuff & what to pot them in aren't offering customers the same care.

it's true Karen, people love those little succulent terrariums and I had to sell them in the greenhouse where I worked, (not my idea) I tried to be honest with customers by letting them know that they're really working against nature with these and that, if they lived, they would need to be potted in fast draining soil in a pot with drainage when they outgrew the glass container. They still bought them tho, I'll be glad when that trend is over......