Yes, that would be nice. Do you think she could also flag your flowers for watering, or would that not be acceptable. I know the flowers don't last long, so if you ask her for ten honeycombs, flowers may wilt half way through and she stops because of this. If you're not around to notice them wilt you might be disappointed to see her task is not complete when you come back. May also think she's slacking and doc her wages a bit Would be like her making feed for the animals and feeding them???
I would say no to flagging the flowers. You might want to save them to help a neighbor with a derby help task. Rose also doesn't harvest any crops, so flagging doesn't fit imho.