Looks like black spot. There could also be the fungus, Cercospora, as well. Both fungi can be present at the same time.

Black spot has fuzzy edges, and Cercospora is grayish/tan in color, not black like black spot is.

Miniature roses are extremely susceptible to both black spot and Cercospora. Infected leaves will eventually drop off so it is important for your daughter to begin a regular fungicide treatment routine. The will prevent new leaves which will come as the mini recovers to be infected.

In time the mini will return to blooming very well if spraying for the fungi is kept up. Those grocery store mini roses are usually grown 4+ bushes in a pot. When the infected rose recovers well it can be divided and each individual little bush be given its own pot. In your daughter's warm climate they can do pretty well. Light colored pots are important because outside they can roast in black plastic pots.

Mites also plague mini roses. Mites and fungi...the bane of growing minis in a hot, humid climate. Control both nasties and he roses will flourish if also well watered, fertilized, dead headed...good general care.

Moses

Good eye, k r.

Discrete borders.

Purple, maroon or black lesions.

Tan/grey/brown central necrosis may develop.

Unless, of course, some black liquid is dripping on the foliage from above.

Any update on the black spots on your daughter’s mini, k r?

That grass is growing too close to the bushes. Remove the grass at least 4" out from the bush edges and mulch the bare soil. Continue removing grass as the bushes get bigger, maintaining at least a 4" wide band all around that gets mulched. Your daughter may be surprised at how big those bushes get. The flower and foliage is miniature, but not the size the bush can get. In her climate it's not unusual for minis to get 4+ feet tall and almost as wide. This means that in no time those little bushes can be touching and even growing into one another. This happens often in Florida. Good care is the ticket, plus the 'Paradise,' effect of growing in Florida.

Mister Moses

P.S. Teddy Bear will probably stay little, but two to three times bigger than a Teddy Bear growing under good care conditions here in Pittsburgh, zone 5/6, would get.

Ty, Moses, I agree. I’ll send her a copy of your recommendation.