Can she email you a photo?

Could it be 'Bermuda's Kathleen'? It is a seedling of 'Mutabilis', with similar coloring, but different petal shape.

Here is a link that might be useful: HMF link to 'Bermuda's Kathleen'

Vintage Gardens describes Radway Sunrise as having "flowers in the tradition of Mutabilis". I think that I remember that Heirloom Roses also used to sell Radway Sunrise in the 90s.

I don't know what the foliage is like, but Plaisanterie has similarly colored flowers.

Here is a link that might be useful: Radway Sunrise at Vintage Gardens

It sounds like Playboy, or one of its descendants.

Single, modern foliage, "Mutabilis" coloring and rust? Sounds awfully like Playboy to me. Kim

Yes, I do think it might be 'Playboy'. I've sent my friend a link to its listing on HMF for confirmation.

Thanks for jogging my memory. I knew there was a modern rose with Mutabilis-like coloring but could not remember what it was. (In fact, it seems that there may be several, but Playboy was the one I was thinking of.) And I thought that the rust was an important clue, too.

Folly